[argyllcms] Re: RGB Printer profiling and ColorSavvy CM2C
- From: Gerhard Fuernkranz <nospam456@xxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 03 Aug 2005 09:15:07 +0200
Alastair M. Robinson schrieb:
The standard colour correction used in Gutenprint attempts to
compensate for the differences in hue and luminance between printer C,
M and to a lesser extent Y, and screen G+B, R+B and R+G respectively.
This is done by converting the data to HSL, and using some
parameterised curves to adjust the HSL values. H is adjusted, then
the amount of S and L adjustment is determined from further curves, in
respect of H. There are separate sets of curves for each family or
generation of printer.
I'm just surprised, that it even performs a mangling when printing to
PostScript, since eventually, rendering PS to the printer's raster
format with ghostscript, using a gimp-print backend, will apply color
corrections again. So eventually they are applied twice. But obviously,
as you explained, they can be turned off (unfortunately I cannot find
this control in my installed version - probably too old).
Thanks,
Gerhard
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