ppmtopj(1) convert a portable pixmap to an HP PaintJet file


ppmtopj [-gamma val] [-xpos val] [-ypos val] [-back dark|lite] [-rle] [-center] [-render 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 -map with a map file such as:

    8 1
    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.


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


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


Copyright (C) 1991 by Christos Zoulas.