ImageMagick(k) ImageMagick(k) NAME ImageMagick - commandline utilities to create, edit, or convert images SYNOPSIS animate [ options ... ] file [ [ options ... ] file ... ] composite [ options ... ] image composite [ mask ] compos- ited conjure [ options ] script.msl [ [ options ] script.msl ] convert [ [ options ... ] [ input_file ... ] ... [ out- put_file ] ] display [ options ... ] file ... [ [options ... ]file ... ] identify file [ file ... ] import [ options ... ] file mogrify [ options ... ] file ... montage [ options ... ] file [ [ options ... ] file ... ] output_file DESCRIPTION ImageMagick provides a suite of commandline utilities for creating, converting, editing, and displaying images: Display is a machine architecture independent image pro- cessing and display program. It can display an image on any workstation display running an X server. Import reads an image from any visible window on an X server and outputs it as an image file. You can capture a single window, the entire screen, or any rectangular por- tion of the screen. Montage creates a composite by combining several separate images. The images are tiled on the composite image with the name of the image optionally appearing just below the individual tile. Convert converts an input file using one image format to an output file with a differing image format. Mogrify transforms an image or a sequence of images. These transforms include image scaling, image rotation, color reduction, and others. The transmogrified image overwrites the original image. Identify describes the format and characteristics of one or more image files. It will also report if an image is incomplete or corrupt. Composite composites images to create new images. Conjure interprets and executes scripts in the Magick Scripting Language (MSL). The ImageMagick utilities recognize the following image formats: Name Mode Description o 8BIM *rw- Photoshop resource format o AFM *r-- TrueType font o APP1 *rw- Photoshop resource format o ART *r-- PF1: 1st Publisher o AVI *r-- Audio/Visual Interleaved o AVS *rw+ AVS X image o BIE *rw- Joint Bi-level Image experts Group interchange format o BMP *rw+ Microsoft Windows bitmap image o CAPTION *r+ Caption (requires separate size info) o CMYK *rw- Raw cyan, magenta, yellow, and black samples (8 or 16 bits, depending on the image depth) o CMYKA *rw- Raw cyan, magenta, yellow, black, and matte samples (8 or 16 bits, depending on the image depth) o CUT *r-- DR Hallo o DCM *r-- Digital Imaging and Communications in Medicine image o DCX *rw+ ZSoft IBM PC multi-page Paintbrush o DIB *rw+ Microsoft Windows bitmap image o DPS *r-- Display Postscript o DPX *r-- Digital Moving Picture Exchange o EPDF *rw- Encapsulated Portable Document Format o EPI *rw- Adobe Encapsulated PostScript Interchange format o EPS *rw- Adobe Encapsulated PostScript o EPS2 *-w- Adobe Level II Encapsulated PostScript o EPS3 *-w- Adobe Level III Encapsulated PostScript o EPSF *rw- Adobe Encapsulated PostScript o EPSI *rw- Adobe Encapsulated PostScript Interchange format o EPT *rw- Adobe Encapsulated PostScript with TIFF preview o FAX *rw+ Group 3 FAX o FILE *r-- Uniform Resource Locator o FITS *rw- Flexible Image Transport System o FPX *rw- FlashPix Format o FTP *r-- Uniform Resource Locator o G3 *rw- Group 3 FAX o GIF *rw+ CompuServe graphics interchange format o GIF87 *rw- CompuServe graphics interchange format (version 87a) o GRADIENT *r-- Gradual passing from one shade to another o GRANITE *r-- Granite texture o GRAY *rw+ Raw gray samples (8 or 16 bits, depending on the image depth) o H *rw- Internal format o HDF -rw+ Hierarchical Data Format o HISTOGRAM *-w- Histogram of the image o HTM *-w- Hypertext Markup Language and a client-side image map o HTML *-w- Hypertext Markup Language and a client-side image map o HTTP *r-- Uniform Resource Locator o ICB *rw+ Truevision Targa image o ICM *rw- ICC Color Profile o ICO *r-- Microsoft icon o ICON *r-- Microsoft icon o IMPLICIT *--- o IPTC *rw- IPTC Newsphoto o JBG *rw+ Joint Bi-level Image experts Group interchange format o JBIG *rw+ Joint Bi-level Image experts Group interchange format o JP2 *rw- JPEG-2000 JP2 File Format Syntax o JPC *rw- JPEG-2000 Code Stream Syntax o JPEG *rw- Joint Photographic Experts Group JFIF format o JPG *rw- Joint Photographic Experts Group JFIF format o LABEL *r-- Text image format o LOGO *rw- ImageMagick Logo o M2V *rw+ MPEG-2 Video Stream o MAP *rw- Colormap intensities (8 or 16 bits, depending on the image depth) and indices (8 or 16 bits, depending on whether colors exceeds 256). o MAT *-w+ MATLAB image format o MATTE *-w+ MATTE format o MIFF *rw+ Magick image format o MNG *rw+ Multiple-image Network Graphics o MONO *rw- Bi-level bitmap in least-significant- -byte-first order o MPC -rw- Magick Persistent Cache image format o MPEG *rw+ MPEG-1 Video Stream o MPG *rw+ MPEG-1 Video Stream o MPR *r-- Magick Persistent Registry o MSL *r-- Magick Scripting Language o MTV *rw+ MTV Raytracing image format o MVG *rw- Magick Vector Graphics o NETSCAPE *r-- Netscape 216 color cube o NULL *r-- Constant image of uniform color o OTB *rw- On-the-air bitmap o P7 *rw+ Xv thumbnail format o PAL *rw- 16bit/pixel interleaved YUV o PALM *rw- Palm Pixmap format o PBM *rw+ Portable bitmap format (black and white) o PCD *rw- Photo CD o PCDS *rw- Photo CD o PCL *-w- Page Control Language o PCT *rw- Apple Macintosh QuickDraw/PICT o PCX *rw- ZSoft IBM PC Paintbrush o PDB *r-- Pilot Image Format o PDF *rw+ Portable Document Format o PFA *r-- TrueType font o PFB *r-- TrueType font o PFM *r-- TrueType font o PGM *rw+ Portable graymap format (gray scale) o PICON *rw- Personal Icon o PICT *rw- Apple Macintosh QuickDraw/PICT o PIX *r-- Alias/Wavefront RLE image format o PLASMA *r-- Plasma fractal image o PM *rw- X Windows system pixmap (color) o PNG *rw- Portable Network Graphics o PNM *rw+ Portable anymap o PPM *rw+ Portable pixmap format (color) o PREVIEW *-w- Show a preview an image enhancement, effect, or f/x o PS *rw+ Adobe PostScript o PS2 *-w+ Adobe Level II PostScript o PS3 *-w+ Adobe Level III PostScript o PSD *rw- Adobe Photoshop bitmap o PTIF *rw- Pyramid encoded TIFF o PWP *r-- Seattle Film Works o RAS *rw+ SUN Rasterfile o RGB *rw+ Raw red, green, and blue samples (8 or 16 bits, depending on the image depth) o RGBA *rw+ Raw red, green, blue, and matte samples (8 or 16 bits, depending on the image depth) o RLA *r-- Alias/Wavefront image o RLE *r-- Utah Run length encoded image o ROSE *rw- 70x46 Truecolor test image o SCT *r-- Scitex HandShake o SFW *r-- Seattle Film Works o SGI *rw+ Irix RGB image o SHTML *-w- Hypertext Markup Language and a client-side image map o STEGANO *r-- Steganographic image o SUN *rw+ SUN Rasterfile o SVG *rw+ Scalable Vector Gaphics o TEXT *rw+ Raw text o TGA *rw+ Truevision Targa image o TIF *rw+ Tagged Image File Format o TIFF *rw+ Tagged Image File Format o TILE *r-- Tile image with a texture o TIM *r-- PSX TIM o TTF *r-- TrueType font o TXT *rw+ Raw text o UIL *-w- X-Motif UIL table o UYVY *rw- 16bit/pixel interleaved YUV o VDA *rw+ Truevision Targa image o VICAR *rw- VICAR rasterfile format o VID *rw+ Visual Image Directory o VIFF *rw+ Khoros Visualization image o VST *rw+ Truevision Targa image o WBMP *rw- Wireless Bitmap (level 0) image o WMF *r-- Windows Metafile o WPG *r-- Word Perfect Graphics o X *rw- X Image o XBM *rw- X Windows system bitmap (black and white) o XC *r-- Constant image uniform color o XCF *r-- GIMP image o XML *r-- Scalable Vector Gaphics o XPM *rw- X Windows system pixmap (color) o XV *rw+ Khoros Visualization image o XWD *rw- X Windows system window dump (color) o YUV *rw- CCIR 601 4:1:1 Modes: * Native blob support r Read w Write + Multi-image Support for some of these formats require additional pro- grams or libraries. README tells where to find this soft- ware. Note, a format delineated with + means that if more than one image is specified, it is composited into a single multi-image file. Use +adjoin if you want a single image produced for each frame. Your installation might not support all of the formats in the list. To get an up-to-date listing of the formats supported by your particular configuration, run "convert -list format". Raw images are expected to have one byte per pixel unless ImageMagick is compiled in 16-bit mode. Here, the raw data is expected to be stored two bytes per pixel in most-sig- nificant-byte-first order. You can tell if ImageMagick was compiled in 16-bit mode by typing "convert" without any options, and looking for "Q:16" in the first line of output. OPTIONS Options are processed in command line order. Any option you specify on the command line remains in effect for the set of images that follows, until the set is terminated by the appearance of any option or -noop. Some options only affect the decoding of images and others only the encod- ing. The latter can appear after the final group of input images. This is a combined list of the commandline options used by the ImageMagick utilities (animate, composite, convert, display, identify, import, mogrify and montage). In this document, angle brackets ("<>") enclose variables, and curly brackets ("{}") enclose optional parameters. For example, "-fuzz <distance>{%}" means you can use the option "-fuzz 10" or "-fuzz 2%". -adjoin join images into a single multi-image file By default, all images of an image sequence are stored in the same file. However, some formats (e.g. JPEG) do not support more than one image and are saved to separate files. Use +adjoin to force this behavior. -affine <matrix> drawing transform matrix -antialias remove pixel aliasing -append append a set of images This option creates a single image where the images in the original set are stacked top-to-bottom. If they are not of the same width, any narrow images will be expanded to fit using the background color. Use +append to stack images left-to-right. The set of images is terminated by the appearance of any option. If the -append option appears after all of the input images, all images are appended. -average average a set of images The set of images is terminated by the appearance of any option. If the -average option appears after all of the input images, all images are aver- aged. -backdrop <color> display the image centered on a backdrop. This backdrop covers the entire workstation screen and is useful for hiding other X window activity while viewing the image. The color of the backdrop is specified as the background color. The color is specified using the format described in the "Color Names" section of X(X). Refer to "X Resources", below, for details. -background <color> the background color The color is specified using the format described in the "Color Names" section of X(X). -blur <radius>x<sigma> blur the image with a gaussian operator Blur with the given radius and standard deviation (sigma). -border <width>x<height> surround the image with a border of color See -geometry for details about the geometry speci- fication. -bordercolor <color> the border color The color is specified using the format described in the "Color Names" section of X(X). -borderwidth <geometry> the border width -box <color> set the color of the annotation bounding box The color is specified using the format described in the "Color Names" section of X(X). See -draw for further details. -cache <threshold> megabytes of memory available to the pixel cache Image pixels are stored in memory until 80 megabytes of memory have been consumed. Subsequent pixel operations are cached on disk. Operations to memory are significantly faster but if your computer does not have a sufficient amount of free memory you may want to adjust this threshold value. -channel <type> the type of channel Choose from: Red, Green, Blue, Opacity, Cyan, Magenta, Yellow, or Black. Use this option to extract a particular channel from the image. Matte, for example, is useful for extracting the opacity values from an image. -charcoal <factor> simulate a charcoal drawing -chop <width>x<height>{+-}<x>{+-}<y>{%} remove pixels from the interior of an image Width and height give the number of columns and rows to remove, and x and y are offsets that give the location of the leftmost column and topmost row to remove. The x offset normally specifies the leftmost column to remove. If the -gravity option is present with NorthEast, East, or SouthEast gravity, it gives the distance leftward from the right edge of the image to the rightmost column to remove. Similarly, the y offset normally specifies the topmost row to remove, but if the -gravity option is present with SouthWest, South, or SouthEast gravity, it speci- fies the distance upward from the bottom edge of the image to the bottom row to remove. The -chop option removes entire rows and columns, and moves the remaining corner blocks leftward and upward to close the gaps. -clip apply the clipping path, if one is present If a clipping path is present, it will be applied to subsequent operations. For example, if you type the following command: convert -clip -negate cockatoo.tif negated.tif only the pixels within the clipping path are negated. The -clip feature requires the XML library. If the XML library is not present, the option is ignored. -coalesce merge a sequence of images Each image N in the sequence after Image 0 is replaced with the image created by flattening images 0 through N. The set of images is terminated by the appearance of any option. If the -coalesce option appears after all of the input images, all images are coa- lesced. -colorize <value> colorize the image with the pen color Specify the amount of colorization as a percentage. You can apply separate colorization values to the red, green, and blue channels of the image with a colorization value list delineated with slashes (e.g. 0/0/50). -colormap <type> define the colormap type Choose between shared or private. This option only applies when the default X server visual is PseudoColor or GRAYScale. Refer to -visual for more details. By default, a shared col- ormap is allocated. The image shares colors with other X clients. Some image colors could be approximated, therefore your image may look very different than intended. Choose Private and the image colors appear exactly as they are defined. However, other clients may go technicolor when the image colormap is installed. -colors <value> preferred number of colors in the image The actual number of colors in the image may be less than your request, but never more. Note, this is a color reduction option. Images with less unique colors than specified with this option will have any duplicate or unused colors removed. Refer to quantize for more details. Note, options -dither, -colorspace, and -treedepth affect the color reduction algorithm. -colorspace <value> the type of colorspace Choices are: GRAY, OHTA, RGB, Transparent, XYZ, YCbCr, YIQ, YPbPr, YUV, or CMYK. Color reduction, by default, takes place in the RGB color space. Empirical evidence suggests that dis- tances in color spaces such as YUV or YIQ corre- spond to perceptual color differences more closely than do distances in RGB space. These color spaces may give better results when color reducing an image. Refer to quantize for more details. The Transparent color space behaves uniquely in that it preserves the matte channel of the image if it exists. The -colors or -monochrome option is required for this option to take effect. -comment <string> annotate an image with a comment Use this option to assign a specific comment to the image. You can include the image filename, type, width, height, or other image attribute by embed- ding special format characters: %b file size %c comment %d directory %e filename extention %f filename %h height %i input filename %k number of unique colors %l label %m magick %n number of scenes %o output filename %p page number %q quantum depth %s scene number %t top of filename %u unique temporary filename %w width %x x resolution %y y resolution %# signature \n newline \r carriage return For example, -comment "%m:%f %wx%h" produces an image comment of MIFF:bird.miff 512x480 for an image titled bird.miff and whose width is 512 and height is 480. If the first character of string is @, the image comment is read from a file titled by the remaining characters in the string. -compose <operator> the type of image composition [This option is not used by convert but this sec- tion is included because it describes the composite operators that are used by the -draw option of con- vert.] By default, each of the composite image pixels are replaced by the corresponding image tile pixel. You can choose an alternate composite operation: Over In Out Atop Xor Plus Minus Add Subtract Difference Multiply Bumpmap Copy CopyRed CopyGreen CopyBlue CopyOpacity How each operator behaves is described below. Over The result will be the union of the two image shapes, with opaque areas of composite image obscuring image in the region of overlap. In The result is simply composite image cut by the shape of image. None of the image data of image will be in the result. Out The resulting image is composite image with the shape of image cut out. Atop The result is the same shape as image image, with composite image obscuring image where the image shapes overlap. Note this differs from over because the portion of composite image outside image's shape does not appear in the result. Xor The result is the image data from both com- posite image and image that is outside the overlap region. The overlap region will be blank. Plus The result is just the sum of the image data. Output values are cropped to 255 (no overflow). This operation is independent of the matte channels. Minus The result of composite image - image, with underflow cropped to zero. The matte channel is ignored (set to 255, full coverage). Add The result of composite image + image, with overflow wrapping around (mod 256). Subtract The result of composite image - image, with underflow wrapping around (mod 256). The add and subtract operators can be used to perform reversible transformations. Difference The result of abs(composite image - image). This is useful for comparing two very similar images. Multiply The result of composite image * image. This is useful for the creation of drop-shadows. Bumpmap The result image shaded by composite image. Copy The resulting image is image replaced with composite image. Here the matte information is ignored. CopyRed The resulting image is the red layer in image replaced with the red layer in composite image. The other layers are copied untouched. CopyGreen The resulting image is the green layer in image replaced with the green layer in com- posite image. The other layers are copied untouched. CopyBlue The resulting image is the blue layer in image replaced with the blue layer in compos- ite image. The other layers are copied untouched. CopyOpacity The resulting image is the matte layer in image replaced with the matte layer in com- posite image. The other layers are copied untouched. The image compositor requires a matte, or alpha channel in the image for some operations. This extra channel usually defines a mask which repre- sents a sort of a cookie-cutter for the image. This is the case when matte is 255 (full coverage) for pixels inside the shape, zero outside, and between zero and 255 on the boundary. For certain operations, if image does not have a matte chan- nel, it is initialized with 0 for any pixel match- ing in color to pixel location (0,0), otherwise 255 (to work properly borderwidth must be 0). -compress <type> the type of image compression Choices are: None, BZip, Fax, Group4, JPEG, Loss- less, LZW, RLE or Zip. Specify +compress to store the binary image in an uncompressed format. The default is the compres- sion type of the specified image file. If LZW compression is specified but LZW compression has not been enabled, the image data will be writ- ten in an uncompressed LZW format that can be read by LZW decoders. This may result in larger-than- expected GIF files. "Lossless" refers to lossless JPEG, which is only available if the JPEG library has been patched to support it. -contrast enhance or reduce the image contrast This option enhances the intensity differences between the lighter and darker elements of the image. Use -contrast to enhance the image or +con- trast to reduce the image contrast. -crop <width>x<height>{+-}<x>{+-}<y>{%} preferred size and location of the cropped image See -geometry for details about the geometry speci- fication. The width and height give the size of the image that remains after cropping, and x and y are off- sets that give the location of the top left corner of the cropped image with respect to the original image. To specify the amount to be removed, use -shave instead. To specify a percentage width or height to be removed instead, append %. For example to crop the image by ten percent (five percent on each side of the image), use -crop 10%. If the x and y offsets are present, a single image is generated, consisting of the pixels from the cropping region. The offsets specify the location of the upper left corner of the cropping region measured downward and rightward with respect to the upper left corner of the image. If the -gravity option is present with NorthEast, East, or South- East gravity, it gives the distance leftward from the right edge of the image to the right edge of the cropping region. Similarly, if the -gravity option is present with SouthWest, South, or South- East gravity, the distance is measured upward between the bottom edges. If the x and y offsets are omitted, a set of tiles of the specified geometry, covering the entire input image, is generated. The rightmost tiles and the bottom tiles are smaller if the specified geom- etry extends beyond the dimensions of the input image. -cycle <amount> displace image colormap by amount Amount defines the number of positions each col- ormap entry is shifted. -debug enable debug printout -deconstruct break down an image sequence into constituent parts The sequence of images is terminated by the appear- ance of any option. If the -deconstruct option appears after all of the input images, all images are deconstructed. -delay <1/100ths of a second> display the next image after pausing This option is useful for regulating the animation of image sequences Delay/100 seconds must expire before the display of the next image. The default is no delay between each showing of the image sequence. The maximum delay is 65535. You can specify a delay range (e.g. -delay 10-500) which sets the minimum and maximum delay. -density <width>x<height> vertical and horizontal resolution in pixels of the image This option specifies an image density when decod- ing a PostScript or Portable Document page. The default is 72 dots per inch in the horizontal and vertical direction. This option is used in concert with -page. -depth <value> depth of the image This is the number of bits in a color sample within a pixel. The only acceptable values are 8 or 16. Use this option to specify the depth of raw images whose depth is unknown such as GRAY, RGB, or CMYK, or to change the depth of any image after it has been read. -descend obtain image by descending window hierarchy -despeckle reduce the speckles within an image -displace <horizontal scale>x<vertical scale> shift image pixels as defined by a displacement map With this option, composite image is used as a dis- placement map. Black, within the displacement map, is a maximum positive displacement. White is a maximum negative displacement and middle gray is neutral. The displacement is scaled to determine the pixel shift. By default, the displacement applies in both the horizontal and vertical direc- tions. However, if you specify mask, composite image is the horizontal X displacement and mask the vertical Y displacement. -display <host:display[.screen]> specifies the X server to contact This option is used with convert for obtaining image or font from this X server. See X(X). -dispose <method> GIF disposal method Here are the valid methods: 0 No disposal specified. 1 Do not dispose between frames. 2 Overwrite frame with background color from header. 3 Overwrite with previous frame. -dissolve <percent> dissolve an image into another by the given percent The opacity of the composite image is multiplied by the given percent, then it is composited over the main image. -dither apply Floyd/Steinberg error diffusion to the image The basic strategy of dithering is to trade inten- sity resolution for spatial resolution by averaging the intensities of several neighboring pixels. Images which suffer from severe contouring when reducing colors can be improved with this option. The -colors or -monochrome option is required for this option to take effect. Use +dither to turn off dithering and to render Postscript without text or graphic aliasing. -draw <string> annotate an image with one or more graphic primi- tives Use this option to annotate an image with one or more graphic primitives. The primitives include point x,y line x0,y0 x1,y1 rectangle x0,y0 x1,y1 roundRectangle x0,y0 w,h wc,hc arc x0,y0 x1,y1 a0,a1 ellipse x0,y0 rx,ry a0,a1 circle x0,y0 x1,y1 polyline x0,y0 ... xn,yn polygon x0,y0 ... xn,yn bezier x0,y0 ... xn,yn path path specification color x0,y0 method matte x0,y0 method text x0,y0 string image operator x0,y0 w,h filename Point requires a single coordinate. Line requires a start and end coordinate, while rectangle expects an upper left and lower right coordinate. RoundRectangle has a center coordinate, a width and height, and the width and height of the corners. Circle has a center coordinate and a coordinate for the outer edge. Use Arc to circumscribe an arc within a rectangle. Arcs require a start and end point as well as the degree of rotation (e.g. 130,30 200,100 45,90). Use Ellipse to draw a par- tial ellipse centered at the given point with the x-axis and y-axis radius and start and end of arc in degrees (e.g. 100,100 100,150 0,360). Finally, polyline and polygon require three or more coordi- nates to define its boundaries. Coordinates are integers separated by an optional comma. For exam- ple, to define a circle centered at 100,100 that extends to 150,150 use: -draw 'circle 100,100 150,150' See Paths. Paths represent an outline of an object which is defined in terms of moveto (set a new cur- rent point), lineto (draw a straight line), curveto (draw a curve using a cubic bezier), arc (ellipti- cal or circular arc) and closepath (close the cur- rent shape by drawing a line to the last moveto) elements. Compound paths (i.e., a path with sub- paths, each consisting of a single moveto followed by one or more line or curve operations) are possi- ble to allow effects such as "donut holes" in objects. Use color to change the color of a pixel to the fill color (see -fill. Follow the pixel coordinate with a method: point replace floodfill filltoborder reset Consider the target pixel as that specified by your coordinate. The point method recolors the target pixel. The replace method recolors any pixel that matches the color of the target pixel. Floodfill recolors any pixel that matches the color of the target pixel and is a neighbor, whereas filltobor- der recolors any neighbor pixel that is not the border color. Finally, reset recolors all pixels. Use matte to the change the pixel matte value to transparent. Follow the pixel coordinate with a method (see the color primitive for a description of methods). The point method changes the matte value of the target pixel. The replace method changes the matte value of any pixel that matches the color of the target pixel. Floodfill changes the matte value of any pixel that matches the color of the target pixel and is a neighbor, whereas filltoborder changes the matte value of any neigh- bor pixel that is not the border color (-border- color). Finally reset changes the matte value of all pixels. Use text to annotate an image with text. Follow the text coordinates with a string. If the string has embedded spaces, enclose it in double quotes. Optionally you can include the image filename, type, width, height, or other image attribute by embedding special format character. See -comment for details. For example, -draw 'text 100,100 "%m:%f %wx%h"' annotates the image with MIFF:bird.miff 512x480 for an image titled bird.miff and whose width is 512 and height is 480. Use image to composite an image with another image. Follow the image keyword with the composite opera- tor, image location, image size, and filename: -draw 'image Over 100,100 225,225 image.jpg' See -compose for a description of the composite operators. If the first character of string is @, the text is read from a file titled by the remaining characters in the string. You can set the primitive color, font, and font bounding box color with -fill, -font, and -box respectively. Options are processed in command line order so be sure to use these options before the -draw option. -edge <radius> detect edges within an image -emboss emboss an image -endian <type> specify endianness (MSB or LSB) of output image Use +endian to revert to unspecified endianness. -enhance apply a digital filter to enhance a noisy image -equalize perform histogram equalization to the image -fill <color> color to use when filling a graphic primitive The color is specified using the format described in the "Color Names" section of X(X). See -draw for further details. -filter <type> use this type of filter when resizing an image Use this option to affect the resizing operation of an image (see -geometry). Choose from these fil- ters: Point Box Triangle Hermite Hanning Hamming Blackman Gaussian Quadratic Cubic Catrom Mitchell Lanczos Bessel Sinc The default filter is Lanczos -flatten flatten a sequence of images The sequence of images is replaced by a single image created by composing each image after the first over the first image. The sequence of images is terminated by the appear- ance of any option. If the -flatten option appears after all of the input images, all images are flat- tened. -flip create a "mirror image" reflect the scanlines in the vertical direction. -flop create a "mirror image" reflect the scanlines in the horizontal direction. -font <name> use this font when annotating the image with text You can tag a font to specify whether it is a Postscript, Truetype, or OPTION1 font. For exam- ple, Arial.ttf is a Truetype font, ps:helvetica is Postscript, and x:fixed is OPTION1. -foreground <color> define the foreground color The color is specified using the format described in the "Color Names" section of X(X). -format <type> the image format type This option will convert any image to the image format you specify. See ImageMagick(k) for a list of image format types supported by ImageMagick. By default the file is written to its original name. However, if the filename extension matches a supported format, the extension is replaced with the image format type specified with -format. For example, if you specify tiff as the format type and the input image filename is image.gif, the output image filename becomes image.tiff. -format <string> output formatted image characteristics Use this option to print information about the image in a format of your choosing. You can include the image filename, type, width, height, or other image attributes by embedding special format characters: %b file size %c comment %d directory %e filename extention %f filename %h height %i input filename %k number of unique colors %l label %m magick %n number of scenes %o output filename %p page number %q quantum depth %s scene number %t top of filename %u unique temporary filename %w width %x x resolution %y y resolution %# signature \n newline \r carriage return For example, -format "%m:%f %wx%h" displays MIFF:bird.miff 512x480 for an image titled bird.miff and whose width is 512 and height is 480. If the first character of string is @, the format is read from a file titled by the remaining charac- ters in the string. -frame <width>x<height>+<outer bevel width>+<inner bevel width> surround the image with an ornamental border See -geometry for details about the geometry speci- fication. The -frame option is not affected by the -gravity option. The color of the border is specified with the -mat- tecolor command line option. -frame include the X window frame in the imported image -fuzz <distance>{%} colors within this distance are considered equal A number of algorithms search for a target color. By default the color must be exact. Use this option to match colors that are close to the target color in RGB space. For example, if you want to automati- cally trim the edges of an image with -trim but the image was scanned and the target background color may differ by a small amount. This option can account for these differences. The distance can be in absolute intensity units or, by appending "%", as a percentage of the maximum possible intensity (255 or 65535). -gamma <value> level of gamma correction The same color image displayed on two different workstations may look different due to differences in the display monitor. Use gamma correction to adjust for this color difference. Reasonable values extend from 0.8 to 2.3. You can apply separate gamma values to the red, green, and blue channels of the image with a gamma value list delineated with slashes (e.g., 1.7/2.3/1.2). Use +gamma value to set the image gamma level with- out actually adjusting the image pixels. This option is useful if the image is of a known gamma but not set as an image attribute (e.g. PNG images). -gaussian <radius>x<sigma> blur the image with a gaussian operator Use the given radius and standard deviation (sigma). -geometry <width>x<height>{+-}<x>{+-}<y>{%}{@} {!}{<}{>} preferred size and location of the Image window. By default, the window size is the image size and the location is chosen by you when it is mapped. By default, the width and height are maximum val- ues. That is, the image is expanded or contracted to fit the width and height value while maintaining the aspect ratio of the image. Append an exclama- tion point to the geometry to force the image size to exactly the size you specify. For example, if you specify 640x480! the image width is set to 640 pixels and height to 480. If only the width is specified, the width assumes the value and the height is chosen to maintain the aspect ratio of the image. Similarly, if only the height is specified (e.g., -geometry x256), the width is chosen to maintain the aspect ratio. To specify a percentage width or height instead, append %. The image size is multiplied by the width and height percentages to obtain the final image dimensions. To increase the size of an image, use a value greater than 100 (e.g. 125%). To decrease an image's size, use a percentage less than 100. Use @ to specify the maximum area in pixels of an image. Use > to change the dimensions of the image only if its width or height exceeds the geometry specifica- tion. < resizes the image only if both of its dimensions are less than the geometry specifica- tion. For example, if you specify '640x480>' and the image size is 256x256, the image size does not change. However, if the image is 512x512 or 1024x1024, it is resized to 480x480. Enclose the geometry specification in quotation marks to pre- vent the < or > from being interpreted by your shell as a file redirection. When used with animate and display, offsets are handled in the same manner as in X(X) and the -gravity option is not used. If the x is negative, the offset is measured leftward from the right edge of the screen to the right edge of the image being displayed. Similarly, negative y is measured between the bottom edges. The offsets are not affected by "%"; they are always measured in pix- els. When used as a composite option, -geometry gives the dimensions of the image and its location with respect to the composite image. If the -gravity option is present with NorthEast, East, or South- East gravity, the x represents the distance from the right edge of the image to the right edge of the composite image. Similarly, if the -gravity option is present with SouthWest, South, or South- East gravity, y is measured between the bottom edges. Accordingly, a positive offset will never point in the direction outside of the image. The offsets are not affected by "%"; they are always measured in pixels. When used as a convert, import or mogrify option, -geometry specifies the size of the output image. The offsets, if present, are ignored. When used as a montage option, -geometry specifies the image size and border size for each tile; default is 256x256+0+0. Negative offsets (border dimensions) are meaningless. The -gravity option affects the placement of the image within the tile; the default gravity for this purpose is Center. If the "%" sign appears in the geometry specification, the tile size is the specified percentage of the original dimensions of the first tile. -gravity <type> direction primitive gravitates to when annotating the image. Choices are: NorthWest, North, NorthEast, West, Center, East, SouthWest, South, SouthEast. The direction you choose specifies where to posi- tion the text or other graphic primitive when anno- tating the image. For example Center gravity forces the text to be centered within the image. By default, the image gravity is NorthWest. See -draw for more details about graphic primitives. The -gravity option is also used in concert with the -geometry option and other options that take <geometry> as a parameter, such as the -crop option. See -geometry for details of how the -gravity option interacts with the <x> and <y> parameters of a geometry specification. When used as an option to composite, -gravity gives the direction that the image gravitates within the composite. When used as an option to montage, -gravity gives the direction that an image gravitates within a tile. The default gravity is Center for this pur- pose. -help print usage instructions -iconGeometry <geometry> specify the icon geometry Offsets, if present in the geometry specification, are handled in the same manner as the -geometry option, using X11 style to handle negative offsets. -iconic iconic animation -immutable make image immutable -implode <factor> implode image pixels about the center -intent <type> use this type of rendering intent when managing the image color Use this option to affect the the color management operation of an image (see -profile). Choose from these intents: Absolute, Perceptual, Relative, Sat- uration The default intent is undefined. -interlace <type> the type of interlacing scheme Choices are: None, Line, Plane, or Partition. The default is None. This option is used to specify the type of inter- lacing scheme for raw image formats such as RGB or YUV. None means do not interlace (RGBRGBRGBRGBRG- BRGB...), Line uses scanline interlacing (RRR...GGG...BBB...RRR...GGG...BBB...), and Plane uses plane interlacing (RRRRRR...GGGGGG...BBBBBB...). Partition is like plane except the different planes are saved to individual files (e.g. image.R, image.G, and image.B). Use Line or Plane to create an interlaced PNG or GIF or progressive JPEG image. -label <name> assign a label to an image Use this option to assign a specific label to the image. Optionally you can include the image file- name, type, width, height, or other image attribute by embedding special format character. See -comment for details. For example, -label "%m:%f %wx%h" produces an image label of MIFF:bird.miff 512x480 for an image titled bird.miff and whose width is 512 and height is 480. If the first character of string is @, the image label is read from a file titled by the remaining characters in the string. When converting to PostScript, use this option to specify a header string to print above the image. Specify the label font with -font. -level <value> adjust the level of image contrast Give three point values delineated with commas: black, mid, and white (e.g. 10,1.0,65000). The white and black points range from 0 to MaxRGB and mid ranges from 0 to 10. -linewidth the line width for subsequent draw operations -list <type> the type of list Choices are: Delegate, Format, Magic, Module, or Type. This option lists entries from the ImageMagick con- figuration files. -loop <iterations> add Netscape loop extension to your GIF animation A value other than zero forces the animation to repeat itself up to iterations times. -magnify <factor> magnify the image -map <filename> choose a particular set of colors from this image [convert or mogrify] By default, color reduction chooses an optimal set of colors that best represent the original image. Alternatively, you can choose a particular set of colors from an image file with this option. Use +map to reduce all images in the image sequence that follows to a single optimal set of colors that best represent all the images. The sequence of images is terminated by the appearance of any option. If the +map option appears after all of the input images, all images are mapped. -map <type> display image using this type. [animate or display] Choose from these Standard Colormap types: best default gray red green blue The X server must support the Standard Colormap you choose, otherwise an error occurs. Use list as the type and display searches the list of colormap types in top-to-bottom order until one is located. See xstdcmap(p) for one way of creating Standard Colormaps. -mask <filename> Specify a clipping mask The image read from the file is used as a clipping mask. It must have the same dimensions as the image being masked. If the mask image contains an opacity channel, the opacity of each pixel is used to define the mask. Otherwise, the intensity (gray level) of each pixel is used. Use +mask to remove the clipping mask. It is not necessary to use -clip to activate the mask; -clip is implied by -mask. -matte store matte channel if the image has one If the image does not have a matte channel, create an opaque one. Use +matte to ignore the matte channel and to avoid writing a matte channel in the output file. -mattecolor <color> specify the matte color The color is specified using the format described in the "Color Names" section of X(X). -median <radius> apply a median filter to the image -mode <value> mode of operation -modulate <value> vary the brightness, saturation, and hue of an image Specify the percent change in brightness, the color saturation, and the hue separated by commas. For example, to increase the color brightness by 20% and decrease the color saturation by 10% and leave the hue unchanged, use: -modulate 120,90. -monochrome transform the image to black and white -morph <frames> morphs an image sequence Both the image pixels and size are linearly inter- polated to give the appearance of a meta-morphosis from one image to the next. The sequence of images is terminated by the appear- ance of any option. If the -morph option appears after all of the input images, all images are mor- phed. -mosaic create a mosaic from an image sequence The -page option is used to locate the images within the mosaic. The sequence of images is terminated by the appear- ance of any option. If the -mosaic option appears after all of the input images, all images are included in the mosaic. -name name an image -negate replace every pixel with its complementary color The red, green, and blue intensities of an image are negated. White becomes black, yellow becomes blue, etc. Use +negate to only negate the grayscale pixels of the image. -noise <radius|type> add or reduce noise in an image The principal function of noise peak elimination filter is to smooth the objects within an image without losing edge information and without creat- ing undesired structures. The central idea of the algorithm is to replace a pixel with its next neighbor in value within a pixel window, if this pixel has been found to be noise. A pixel is defined as noise if and only if this pixel is a maximum or minimum within the pixel window. Use radius to specify the width of the neighbor- hood. Use +noise followed by a noise type to add noise to an image. Choose from these noise types: Uniform Gaussian Multiplicative Impulse Laplacian Poisson -noop NOOP (no option) The -noop option can be used to terminate a group of images and reset all options to their default values, when no other option is desired. -normalize transform image to span the full range of color values This is a contrast enhancement technique. -opaque <color> change this color to the pen color within the image The color is specified using the format described in the "Color Names" section of X(X). See -fill for more details. -page <width>x<height>{+-}<x>{+-}<y>{%}{!}{<}{>} size and location of an image canvas Use this option to specify the dimensions of the PostScript page in dots per inch or a TEXT page in pixels. The choices for a Postscript page are: 11x17 792 1224 Ledger 1224 792 Legal 612 1008 Letter 612 792 LetterSmall 612 792 ArchE 2592 3456 ArchD 1728 2592 ArchC 1296 1728 ArchB 864 1296 ArchA 648 864 A0 2380 3368 A1 1684 2380 A2 1190 1684 A3 842 1190 A4 595 842 A4Small 595 842 A5 421 595 A6 297 421 A7 210 297 A8 148 210 A9 105 148 A10 74 105 B0 2836 4008 B1 2004 2836 B2 1418 2004 B3 1002 1418 B4 709 1002 B5 501 709 C0 2600 3677 C1 1837 2600 C2 1298 1837 C3 918 1298 C4 649 918 C5 459 649 C6 323 459 Flsa 612 936 Flse 612 936 HalfLetter 396 612 For convenience you can specify the page size by media (e.g. A4, Ledger, etc.). Otherwise, -page behaves much like -geometry (e.g. -page let- ter+43+43>). To position a GIF image, use -page{+-}<x>{+-}<y> (e.g. -page +100+200). For a Postscript page, the image is sized as in -geometry and positioned relative to the lower left hand corner of the page by {+-}<xoffset>{+-}<y off- set>. Use -page 612x792>, for example, to center the image within the page. If the image size exceeds the Postscript page, it is reduced to fit the page. The default gravity for the -page option is NorthWest, i.e., positive x and y offset are measured rightward and downward from the top left corner of the page, unless the -gravity option is present with a value other than NorthWest. The default page dimensions for a TEXT image is 612x792. This option is used in concert with -density. -paint <radius> simulate an oil painting Each pixel is replaced by the most frequent color in a circular neighborhood whose width is specified with radius. -pause <seconds> pause between animation loops [animate] Pause for the specified number of seconds before repeating the animation. -pause <seconds> pause between snapshots [import] Pause for the specified number of seconds before taking the next snapshot. -pen <color> specify the pen color for drawing operations The color is specified using the format described in the "Color Names" section of X(X). -ping efficiently determine image characteristics -pointsize <value> pointsize of the Postscript, OPTION1, or TrueType font -preview <type> image preview type Use this option to affect the preview operation of an image (e.g. convert -preview Gamma Pre- view:gamma.png). Choose from these previews: Rotate Shear Roll Hue Saturation Brightness Gamma Spiff Dull Grayscale Quantize Despeckle ReduceNoise Add Noise Sharpen Blur Threshold EdgeDetect Spread Shade Raise Segment Solarize Swirl Implode Wave OilPaint CharcoalDrawing JPEG The default preview is JPEG. -process <command> process a sequence of images The sequence of images is terminated by the appear- ance of any option. If the -process option appears after all of the input images, all images are pro- cessed. -profile <filename> add ICM, IPTC, or generic profile to image -profile filename adds an ICM (ICC color manage- ment), IPTC (newswire information), or a generic profile to the image. Use +profile icm, +profile iptc, or +profile pro- file_name to remove the respective profile. Use identify -verbose to find out what profiles are in the image file. Use +profile "*" to remove all profiles. -quality <value> JPEG/MIFF/PNG compression level For the JPEG image format, quality is 0 (lowest image quality and highest compression) to 100 (best quality but least effective compression). The default quality is 75. Use the -sampling_factor option to specify the factors for chroma downsam- pling. For the MIFF image format, quality/10 is the zlib compression level, which is 0 (worst but fastest compression) to 9 (best but slowest). It has no effect on the image appearance, since the compres- sion is always lossless. For the MNG and PNG image formats, the quality value sets the zlib compression level (quality / 10) and filter-type (quality % 10). Compression levels range from 0 (fastest compression) to 100 (best but slowest). For compression level 0, the Huffman-only strategy is used, which is fastest but not necessarily the worst compression. If filter-type is 4 or less, the specified filter- type is used for all scanlines: 0: none 1: sub 2: up 3: average 4: Paeth If filter-type is 5, adaptive filtering is used when quality is greater than 50 and the image does not have a color map, otherwise no filtering is used. If filter-type is 6, adaptive filtering with mini- mum-sum-of-absolute-values is used. Only if the output is MNG, if filter-type is 7, the LOCO color transformation and adaptive filtering with minimum-sum-of-absolute-values are used. The default is quality is 75, which means nearly the best compression with adaptive filtering. The quality setting has no effect on the appearance of PNG and MNG images, since the compression is always lossless. For further information, see the PNG specification. -raise <width>x<height> lighten or darken image edges This will create a 3-D effect. See -geometry for details details about the geometry specification. Offsets are not used. Use -raise to create a raised effect, otherwise use +raise. -region <width>x<height>{+-}<x>{+-}<y> apply options to a portion of the image The x and y offsets are treated in the same manner as in -crop. -remote perform a remote operation The only command recognized at this time is the name of an image file to load. -resize <width>x<height>{+-}<x>{+-}<y>{%}{@}{!}{<}{>} resize and locate an image This is an alias for the -geometry option and it behaves in the same manner. If the -filter option precedes the -resize option, the specified filter is used. There are some exceptions: When used as a composite option, -resize conveys the preferred size and location of the output image, while -geometry conveys the size and place- ment of the composite image within the main image. When used as a montage option, -resize conveys the preferred size and location of the montage, while -geometry conveys information about the tiles. -roll {+-}<x>{+-}<y> roll an image vertically or horizontally See -geometry for details the geometry specifica- tion. The x and y offsets are not affected by the -gravity option. A negative x offset rolls the image left-to-right. A negative y offset rolls the image top-to-bottom. -rotate <degrees>{<}{>} apply Paeth image rotation to the image Use > to rotate the image only if its width exceeds the height. < rotates the image only if its width is less than the height. For example, if you spec- ify -rotate "-90>" and the image size is 480x640, the image is not rotated. However, if the image is 640x480, it is rotated by -90 degrees. If you use > or <, enclose it in quotation marks to prevent it from being misinterpreted as a file redirection. Empty triangles left over from rotating the image are filled with the color defined as background (class backgroundColor). See X(X) for details. -sample <geometry> scale image with pixel sampling See -geometry for details about the geometry speci- fication. -sample ignores the -filter selection if the -filter option is present. Offsets, if present in the geometry string, are ignored, and the -grav- ity option has no effect. -sampling_factor <horizontal_factor>x<vertical_factor> sampling factors used by JPEG encoder. This option specifies the sampling factors to be used by the JPEG encoder for chroma downsampling. If this option is omitted, the JPEG library will use its own default values. -scale <geometry> scale the image. See -geometry for details about the geometry speci- fication. -scale uses a simpler, faster algorithm, and it ignores the -filter selection if the -filter option is present. Offsets, if present in the geometry string, are ignored, and the -gravity option has no effect. -scene <value> set scene number This option sets the scene number of an image or the first image in an image sequence. -scenes <value-value> range of image scene numbers to read Each image in the range is read with the filename followed by a period (.) and the decimal scene num- ber. You can change this behavior by embedding a %d, %0Nd, %o, %0No, %x, or %0Nx printf format spec- ification in the file name. For example, montage -scenes 5-7 image.miff makes a montage of files image.miff.5, image.miff.6, and image.miff.7, and animate -scenes 0-12 image%02d.miff animates files image00.miff, image01.miff, through image12.miff. -screen specify the screen to capture This option indicates that the GetImage request used to obtain the image should be done on the root window, rather than directly on the specified win- dow. In this way, you can obtain pieces of other windows that overlap the specified window, and more importantly, you can capture menus or other popups that are independent windows but appear over the specified window. -seed <value> pseudo-random number generator seed value -segment <cluster threshold>x<smoothing threshold> segment an image Segment an image by analyzing the histograms of the color components and identifying units that are homogeneous with the fuzzy c-means technique. Specify cluster threshold as the number of pixels in each cluster must exceed the the cluster thresh- old to be considered valid. Smoothing threshold eliminates noise in the second derivative of the histogram. As the value is increased, you can expect a smoother second derivative. The default is 1.5. See "Image Segmentation", below, for details. -shade <azimuth>x<elevation> shade the image using a distant light source Specify azimuth and elevation as the position of the light source. Use +shade to return the shading results as a grayscale image. -shadow <radius>x<sigma> shadow the montage -shared_memory use shared memory This option specifies whether the utility should attempt use shared memory for pixmaps. ImageMagick must be compiled with shared memory support, and the display must support the MIT-SHM extension. Otherwise, this option is ignored. The default is True. -sharpen <radius>x<sigma> sharpen the image Use a gaussian operator of the given radius and standard deviation (sigma). -shave <width>x<height> shave pixels from the image edges Specify the width of the region to be removed from both sides of the image and the height of the regions to be removed from top and bottom. -shear <x degrees>x<y degrees> shear the image along the X or Y axis Use the specified positive or negative shear angle. Shearing slides one edge of an image along the X or Y axis, creating a parallelogram. An X direction shear slides an edge along the X axis, while a Y direction shear slides an edge along the Y axis. The amount of the shear is controlled by a shear angle. For X direction shears, x degrees is mea- sured relative to the Y axis, and similarly, for Y direction shears y degrees is measured relative to the X axis. Empty triangles left over from shearing the image are filled with the color defined as background (class backgroundColor). See X(X) for details. -silent operate silently -size <width>x<height>{+offset} width and height of the image Use this option to specify the width and height of raw images whose dimensions are unknown such as GRAY, RGB, or CMYK. In addition to width and height, use -size with an offset to skip any header information in the image or tell the number of col- ors in a MAP image file, (e.g. -size 640x512+256). For Photo CD images, choose from these sizes: 192x128 384x256 768x512 1536x1024 3072x2048 Finally, use this option to choose a particular resolution layer of a JBIG or JPEG image (e.g. -size 1024x768). -snaps <value> number of screen snapshots Use this option to grab more than one image from the X server screen, to create an animation sequence. -solarize <factor> negate all pixels above the threshold level Specify factor as the percent threshold of the intensity (0 - 99.9%). This option produces a solarization effect seen when exposing a photographic film to light during the development process. -spread <amount> displace image pixels by a random amount Amount defines the size of the neighborhood around each pixel to choose a candidate pixel to swap. -stegano <offset> hide watermark within an image Use an offset to start the image hiding some number of pixels from the beginning of the image. Note this offset and the image size. You will need this information to recover the steganographic image (e.g. display -size 320x256+35 stegano:image.png). -stereo composite two images to create a stereo anaglyph The left side of the stereo pair is saved as the red channel of the output image. The right side is saved as the green channel. Red-green stereo glasses are required to properly view the stereo image. -stroke <color> color to use when stroking a graphic primitive The color is specified using the format described in the "Color Names" section of X(X). See -draw for further details. -strokewidth <value> set the stroke width See -draw for further details. -swirl <degrees> swirl image pixels about the center Degrees defines the tightness of the swirl. -text_font <name> font for writing fixed-width text Specifies the name of the preferred font to use in fixed (typewriter style) formatted text. The default is 14 point Courier. You can tag a font to specify whether it is a Postscript, Truetype, or OPTION1 font. For exam- ple, Courier.ttf is a Truetype font and x:fixed is OPTION1. -texture <filename> name of texture to tile onto the image background -threshold <value> threshold the image Create a bi-level image such that any pixel inten- sity that is equal or exceeds the threshold is reassigned the maximum intensity otherwise the min- imum intensity. -tile <filename> tile image when filling a graphic primitive -tile <geometry> layout of images [montage] -title <string> assign title to displayed image [animate, display, montage] Use this option to assign a specific title to the image. This is assigned to the image window and is typically displayed in the window title bar. Optionally you can include the image filename, type, width, height, or other image attribute by embedding special format characters: %b file size %c comment %d directory %e filename extention %f filename %h height %i input filename %k number of unique colors %l label %m magick %n number of scenes %o output filename %p page number %q quantum depth %s scene number %t top of filename %u unique temporary filename %w width %x x resolution %y y resolution %# signature \n newline \r carriage return For example, -title "%m:%f %wx%h" produces an image title of MIFF:bird.miff 512x480 for an image titled bird.miff and whose width is 512 and height is 480. -transparent <color> make this color transparent within the image The color is specified using the format described in the "Color Names" section of X(X). -treedepth <value> tree depth for the color reduction algorithm Normally, this integer value is zero or one. A zero or one tells display to choose an optimal tree depth for the color reduction algorithm An optimal depth generally allows the best repre- sentation of the source image with the fastest com- putational speed and the least amount of memory. However, the default depth is inappropriate for some images. To assure the best representation, try values between 2 and 8 for this parameter. Refer to quantize for more details. The -colors or -monochrome option is required for this option to take effect. -trim trim an image This option removes any edges that are exactly the same color as the corner pixels. Use -fuzz to make -trim remove edges that are nearly the same color as the corner pixels. -type <type> the image type Choose from: Bilevel, Grayscale, Palette, PaletteM- atte, TrueColor, TrueColorMatte, ColorSeparation, ColorSeparationMatte, or Optimize. Normally, when a format supports different subfor- mats such as grayscale and truecolor, the encoder will try to choose an efficient subformat. The -type option can be used to overrride this behav- ior. For example, to prevent a JPEG from being written in grayscale format even though only gray pixels are present, use convert bird.pgm -type TrueColor bird.jpg Similarly, using -type TrueColorMatte will force the encoder to write an alpha channel even though the image is opaque, if the output format supports transparency. -update <seconds> detect when image file is modified and redisplay. Suppose that while you are displaying an image the file that is currently displayed is over-written. display will automatically detect that the input file has been changed and update the displayed image accordingly. -units <type> the type of image resolution Choose from: Undefined, PixelsPerInch, or Pix- elsPerCentimeter. -unsharp <radius>x<sigma> sharpen the image with an unsharp mask operator Use the given radius and standard deviation (sigma). -use_pixmap use the pixmap -verbose print detailed information about the image This information is printed: image scene number; image name; image size; the image class (Direct- Class or PseudoClass); the total number of unique colors; and the number of seconds to read and transform the image. Refer to miff for a descrip- tion of the image class. If -colors is also specified, the total unique col- ors in the image and color reduction error values are printed. Refer to quantize for a description of these values. -view <string> FlashPix viewing parameters -visual <type> animate images using this X visual type Choose from these visual classes: StaticGray GrayScale StaticColor PseudoColor TrueColor DirectColor default visual id The X server must support the visual you choose, otherwise an error occurs. If a visual is not specified, the visual class that can display the most simultaneous colors on the default screen is chosen. -watermark <brightness>x<saturation> percent brightness and saturation of a watermark -wave <amplitude>x<wavelength> alter an image along a sine wave Specify amplitude and wavelength of the wave. -window <id> make image the background of a window id can be a window id or name. Specify root to select X's root window as the target window. By default the image is tiled onto the background of the target window. If backdrop or -geometry are specified, the image is surrounded by the back- ground color. Refer to X RESOURCES for details. The image will not display on the root window if the image has more unique colors than the target window colormap allows. Use -colors to reduce the number of colors. -window_group specify the window group -write <filename> write an image sequence [convert, composite] The image sequence following the -write filenameop- tion is written out, and then processing continues with the same image in its current state if there are additional options. To restore the image to its original state after writing it, use the +write filename option. -write <filename> write the image to a file [display] If filename already exists, you will be prompted as to whether it should be overwritten. By default, the image is written in the format that it was read in as. To specify a particular image format, prefix filename with the image type and a colon (e.g., ps:image) or specify the image type as the filename suffix (e.g., image.ps). See con- vert(t) for a list of valid image formats. Specify file as - for standard output. If file has the extension .Z or gzip respectively. Precede the image file name with | to pipe to a system command. Use -compress to specify the type of image compres- sion. The equivalent X resource for this option is write- Filename (class WriteFilename). See "X Resources", below, for details. FILES AND FORMATS By default, the image format is determined by its magic number, i.e., the first few bytes of the file. To specify a particular image format, precede the filename with an image format name and a colon (i.e.ps:image) or specify the image type as the filename suffix. The magic number takes precedence over the filename suffix and the prefix takes precedence over the magic number and the suffix in input files. The prefix takes precedence over the file- name suffix in output files. To read the "built-in" for- mats (GRANITE, H, LOGO, NETSCAPE, PLASMA, and ROSE) use a prefix (including the colon) without a filename or suffix. To read the XC format, follow the colon with a color spec- ification. To read the CAPTION format, follow the colon with a text string or with a filename prefixed with the at symbol (@). When you specify X as your image type, the filename has special meaning. It specifies an X window by id, name, or root. If no filename is specified, the window is selected by clicking the mouse in the desired window. Specify input_file as - for standard input, output_file as - for standard output. If input_file has the extension respectively. If output_file has the extension .Z or the file is compressed using with compress or gzip respec- tively. Finally, when running on platforms that allow it, precede the image file name with | to pipe to or from a system command (this feature is not available on VMS, Win32 and Macintosh platforms). Use an optional index enclosed in brackets after an input file name to specify a desired subimage of a multi-resolu- tion image format like Photo CD (e.g. img0001.pcd[4]) or a range for MPEG images (e.g. video.mpg[50-75]). A subimage specification can be disjoint (e.g. image.tiff[2,7,4]). For raw images, specify a subimage with a geometry (e.g. -size 640x512 image.rgb[320x256+50+50]). Single images are written with the filename you specify. However, multi- part images (e.g., a multi-page PostScript document with +adjoin specified) are written with the filename followed by a period (.) and the scene number. You can change this behavior by embedding a %d, %0Nd, %o, %0No, %x, or %0Nx printf format specification in the file name. For example, image%02d.miff writes files image00.miff, image01.miff, etc. When running a commandline utility, you can prepend an at sign @ to a filename to read a list of image filenames from that file. This is convenient in the event you have too many image filenames to fit on the command line. ENVIRONMENT DISPLAY To get the default host, display number, and screen. SEE ALSO animate(e), display(y), animate(e), display(y), iden- tify(y), import(t), montage(e), mogrify(y), composite(e) COPYRIGHT Copyright (C) 2002 ImageMagick Studio Permission is hereby granted, free of charge, to any per- son obtaining a copy of this software and associated docu- mentation files ("ImageMagick"), to deal in ImageMagick without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of ImageMagick, and to per- mit persons to whom the ImageMagick is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of ImageMagick. The software is provided "as is", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose and noninfringement.In no event shall ImageMagick Studio be liable for any claim, damages or other liabil- ity, whether in an action of contract, tort or otherwise, arising from, out of or in connection with ImageMagick or the use or other dealings in ImageMagick. Except as contained in this notice, the name of the ImageMagick Studio LLC shall not be used in advertising or otherwise to promote the sale, use or other dealings in ImageMagick without prior written authorization from the ImageMagick Studio. AUTHORS John Cristy, ImageMagick Studio LLC, Glenn Randers-Pehrson, ImageMagick Studio LLC. ImageMagick Date: 2002/02/15 01:00:00 ImageMagick(k)