printing images

["Robert Roebling" <robert roebling de>]

  Hello,

I'm currently writing the GNOME print backend
for the printing system of wxWidgets and all
goes well, except for that my little knowledge
of the PostScript language doesn't suffice to
understand what is wrong about my printing code
for images. I'm just trying to print RGB right
now. I use

gnome_print_moveto( gpc, x,y );
gnome_print_rgbimage( gpc, (chunk of RGB data), 32, 32, 32*3 );

but nothing shows up in the printout. It is
there in the file, but something is wrong.
I've included the PS output for a simple test
file (8Kb is hopefully OK). It shows a few lines
and on page 1 one large rectangle and a small one.
The image should be where the small rectangle is,
but it is not. 
I'm aware that this might be an obvious error,
but I don't see it. Maybe the positioning is
outside the visible bounds or the image in
shrunk to zero?

Thanks for any info,

  Robert

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