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



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 con-
       trol  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.


OPTIONS
       -raw   If you specify this, 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  you  don't  specify -margin, the image will start at the left margin (of the window, paper, or what-
              ever).  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.



netpbm documentation             26 April 1991       Ppmtosixel User Manual(0)