[argyllcms] Re: RGB Printer profiling and ColorSavvy CM2C
- From: "Alastair M. Robinson" <blackfive@xxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sat, 30 Jul 2005 23:20:47 +0100
Hi,
Gerhard Fuernkranz wrote:
I also had weak blues and magentas on my inkjet prints in conjunction
with the manufacturer supplied Linux driver (RGB only) and 3rd party
inks and paper. First I tried to move up the cyan and magenta sliders in
Yep, those colours aren't easy to get right. I've done some work on the
curve-based colour correction used in Gutenprint - and the real
complication is that the printer's Cyan ink, and more specifically, the
dark cyans that a naive RGB->CMYK conversion produces are *way* outside
the monitor's gamut. It's very hard to create a simple model to
compensate for that in a way that doesn't also desaturate the blues.
Sounds like the driver you tried had similar issues...
Unfortunately, for RGB printers, profiling cannot generally compensate
all flaws of the color mangling done in the driver. First you need to
find a print mode and driver settings, which deliver maximum gamut, but
still result in a smooth device response, with gradients of less than
1dE per RGB unit at any location within the gamut. This can be a tedious
What would you recommend gamma-wise for profiling? Am I better off
attempting to adjust the gamma to match the screen's 2.2 in the driver,
or print the patches with a gamma setting of something else and allowing
the profiler to handle it?
All the best,
--
Alastair M. Robinson
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