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ppmtosixel(1)					    ppmtosixel(1)

NAME
       ppmtosixel - convert a portable pixmap into DEC sixel for
       mat

SYNOPSIS
       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION
       Reads a portable pixmap as input.  Produces sixel commands
       (SIX) as output.	 The output is formatted for color print
       ing, 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 speci
	      fied, output will default to compressed  format  in
	      which  identical	adjacent  pixels  are replaced by
	      "repeat pixel" commands.	A raw file  is	often  an
	      order  of	 magnitude  larger than a compressed file
	      and prints much slower.

       -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 > /dev/tty0?.

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.

			  26 April 1991		    ppmtosixel(1)

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