Man page 1 : ppmtopj

ppmtopj - convert a portable pixmap to an HP PaintJet file

ppmtopj [-gamma val ] [ -xpos val ] [ -ypos val ] [ -back

R dark | lite ] [ -rle ] [ -center ] [ -render

R none|snap|bw|dither|diffuse|monodither|monodiffuse|clusterdither|monoclusterdither ] [ ppmfile ]

Reads a portable pixmap as input and converts it into a format suitable to be printed by an HP PaintJet printer.

For best results, the input file should be in 8-color RGB form; i.e. it should have only the 8 binary combinations of full-on and full-off primaries. You could get this by sending the input file through ppmquant -mapwith a map file such as:

   P3
    8 1
    255
    0 0 0      255 0 0    0 255 0    0 0 255
    255 255 0  255 0 255  0 255 255  255 255 255

Or else you could use use ppmdither -red 2 -green 2 -blue 2.

-rle

              Run length encode the image. (This can result in larger images)

-back

    Enhance the foreground by indicating if the background is light or dark compated to the foreground.

• -render alg
      Use an internal rendering algorithm (default dither).
• -gamma int
      Gamma correct the image using the integet parameter as a gamma (default 0).

-center

    Center the image to an 8.5 by 11 page

• -xpos pos
      Move by pos pixels in the x direction.
• -ypos pos
      Move by pos pixels in the y direction.

HP PaintJet XL Color Graphics Printer User's Guide

pnmdepth(1), ppmquant(1), ppmdither(1), ppm(5)

Most of the options have not been tested because of the price of the paper.

Copyright (C) 1991 by Christos Zoulas.