[argyllcms] Re: CMYK Profile Problem
- From: Idea Digital Imaging <qcore@xxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 15 Mar 2010 15:10:28 +0000
On 14 Mar 2010, at 23:06, Graeme Gill wrote:
Because a gamut mapping from sRGB is being applied, and
the gamut mapping attempts to map the black point of the sRGB to the
black point of the printer.
Now, one of the subtleties is that the black point of a printer
as far as Argyll is concerned, is the darkest color with the same
hue as black only.
Interesting. And the black in this profile is warm...
[snip]
So, working as designed, but feel free to convince me that this
isn't the right
way to choose the black point for a CMYK device !
I can only convince you that a full black of C57 M67 Y72 K100 is a
PITA to work with :(
For a press, wouldn't it be better to work with a theoretical black
point which is the black max + neutral CMY ratio = total ink limit ?
My assumption was that using -S would generate a perceptual table that
behaves in the same way a device link with perceptual intent and gamut
mapping from sRGB to PSO_LWC_Improved would.
This would create a profile that can be used in Photoshop in the same
way that I use the profiles I've previously adapted using Profilemaker
-- only with a better, gamut mapped perceptual conversion.
--
Martin Orpen
Idea Digital Imaging Ltd
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