Ppmtosixel User Manual(1) General Commands Manual Ppmtosixel User Manual(1)
NAME
ppmtosixel - convert a PPM image to DEC sixel format
SYNOPSIS
ppmtosixel
[-raw]
[-margin]
[ppmfile]
DESCRIPTION
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 as-
signment table begin the SIX file. Image data is in a compressed for-
mat by default. A printer control footer ends the image file.
OPTIONS
In addition to the options common to all programs based on libnetpbm
(most notably -quiet, see
Common Options ⟨index.html#commonoptions⟩ ), ppmtosixel recognizes the
following command line options:
-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 re-
placed by "repeat pixel" commands. A raw file is often an order
of magnitude larger than a compressed file and prints much
slower.
-margin
If you don't specify -margin, the image will start at the left
margin (of the window, paper, or whatever). If you do specify
-margin, 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?.
LIMITATIONS
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(1)
AUTHOR
Copyright (C) 1991 by Rick Vinci.
DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML
source. The master documentation is at
http://netpbm.sourceforge.net/doc/ppmtosixel.html
netpbm documentation 26 April 1991 Ppmtosixel User Manual(1)
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