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pngtopnm !!!pngtopnm NAME SYNOPSIS DESCRIPTION OPTIONS SEE ALSO NOTE BUGS AUTHORS ---- !!NAME pngtopnm - convert a Portable Network Graphics file into a portable anymap !!SYNOPSIS __pngtopnm__ [[-verbose] [[-alpha | -mix] [[-background color] [[-gamma value] [[-text file] [[-time] [[''pngfile''] !!DESCRIPTION Reads a Portable Network Graphics as input. Produces a portable anymap as output. The type of the output file depends on the input file - if it's black pbm'' file is written, else if it's grayscale a ''pgm'' file, else a ''ppm'' file. !!OPTIONS __-verbose__ Display the format of the input file and the type of the output file. If the chunks are part of the ''png-file,'' the alpha, transparency and gamma-values will be indicated. __-alpha__ Output the alpha channel or transparency mask of the image. The result is either a ''pbm'' file or ''pgm'' file, depending on whether different levels of transparency appear. __-mix__ Compose the image with the transparency or alpha mask against a the background. When a background chunk is available that color is taken, else black will do. __-background color__ If no background color chunck is present in the ''png-file,'' or when another color is required this parameter can be used to set the background color of images. This is especially useful for alpha-channel images or those with transparency chunks. The format, to specify the color in, is either (in the case of orange) '' __-gamma value__ Converts the image to a new display-gamma value. When a gAMA chunk is present in the ''png-file,'' the image-gamma value will be used. When not, the image-gamma is considered to be 1.0. Based on the image-gamma and the display-gamma given with this option the colors written to the ''pnm-file'' will be adjusted. Because the gamma's of uncompensated monitors are around 2.6, which results in an image-gamma of 0.45, some typical situations are: when the image-gamma is 0.45 (use -verbose to check) and the picture is too light, your system is gamma-corrected, so convert with __-text file__ Writes the tEXt and zTXt chunks to a file, in a format as described in the ''pnmtopng'' man-page. These chunks contain text comments or annotations. __-time__ Prints the tIME chunk to stderr. All flags can be abbreviated to their shortest unique prefix. !!SEE ALSO pnmtopng(1), ptot(1), pnmgamma(1), pnm(5) !!NOTE Instead of pngtopnm|pnmtoxxx, a specific converter should be used, if available. E.g. ''ptot'' (PNG to TIFF conversion), etc. !!BUGS There could be an option to read the comment text from pnm comments instead of a separate file. The program could be much faster, with a bit of code optimizing. !!AUTHORS Copyright (C) 1995-1997 by Alexander Lehmann and Willem van Schaik. ----
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