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ppmtosixel(1) Unix Programmer's Manual ppmtosixel(1)
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 "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 1