[hpoj-devel] hpinkjet driver gamma correction

[Joe P. <joe...@sn...>]

Earlier I posted that I would try to use a 'gamma.ps' file to darken the 
images printed with the new hpinkjet driver I'm using with my OfficeJet 600. 
Here are the results.

Using the "HP-developed DeskJet 600C series" print filter with the 600 made 
the printed image appear a little too light compared to its image on my 
monitor. The color/brightness differences are partly due to monitor settings, 
but since I'm happy with them, I'd rather change the print output to match.

For those familiar with setting up a gamma.ps file, this is the line I used 
to make the desired correction:

{1.666 exp} dup dup currenttransfer setcolortransfer

A higher number inside the brackets will darken the image.

Some printers may require four correction parameters. In that case, just add 
an extra 'dup'. If you want to change individual colors, replace the 'dup's 
with bracketed parameters.

To save ink, I set this up as a separate queue, keeping the original 
non-gamma-corrected queue for printing drafts.

The brightness of the printed image now looks very much like it appears on my 
monitor, but won't necessarily be correct on other systems.

-- 
Joe