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Ppmtosixel User Manual(0)						Ppmtosixel User Manual(0)

       ppmtosixel - convert a PPM image to DEC sixel format





       This program is part of Netpbm(1)

       ppmtosixel  reads  a  PPM image as input and 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, ppmtosixel rescales them to maxval
       100.   A  printer  control  header and a color assignment table begin the SIX file.  Image
       data is in a compressed format by default.  A printer control footer ends the image file.

       -raw   If you specify this, 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 'repeat pixel' commands.	A raw file  is	often  an
	      order of magnitude larger than a compressed file and prints much slower.

	      If  you don't specify -margin, the image will start at the left margin (of the win-
	      dow, paper, or whatever).  If you do specify -margin, a 1.5 inch left  margin  will
	      offset the image.

       Generally,  sixel  files  must reach the printer unfiltered.  Use the lpr -x option or cat
       filename > /dev/tty0?.

       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.


       Copyright (C) 1991 by Rick Vinci.

netpbm documentation			  26 April 1991 		Ppmtosixel User Manual(0)
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