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ppmtosixel !!!ppmtosixel NAME SYNOPSIS DESCRIPTION OPTIONS PRINTING BUGS SEE ALSO AUTHOR ---- !!NAME ppmtosixel - convert a portable pixmap into DEC sixel format !!SYNOPSIS __ppmtosixel__ [[__-raw__] [[__-margin__] [[''ppmfile''] !!DESCRIPTION Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC LJ250 color inkjet printer. If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file. !!OPTIONS __-raw__ If specified, each pixel will be explicitly described in the image file. If __-raw__ is not specified, output will default to compressed format in which identical adjacent pixels are replaced by __ __-margin__ If __-margin__ is not specified, the image will be start at the left margin (of the window, paper, or whatever). If __-margin__ is specified, a 1.5 inch left margin will offset the image. !!PRINTING Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename !!BUGS Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation. !!SEE ALSO ppm(5) !!AUTHOR Copyright (C) 1991 by Rick Vinci. ----
3 pages link to
ppmtosixel(1)
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pbmfilters(1)
Man1p
ppm(5)
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