Re: Profilemaker 5.0.5b Gamut mapping
Re: Profilemaker 5.0.5b Gamut mapping
- Subject: Re: Profilemaker 5.0.5b Gamut mapping
- From: Roger Breton <email@hidden>
- Date: Mon, 26 Dec 2005 12:55:48 -0500
> I normally use "colorful" ("CIECAM02 GamutMapping"), but regarding the
> changes between v 4.0.4b and 4.0.5b my impressions were very mixed:
> see "http://digitalproof.info/perceptual-rendering/pm505/";
>
> regards, Klaus
That synthetic RGB test image you posted is wunderbar to explore the RGB ->
CMYK mapping of output profiles. I must confess I was a big fan of similar
synthetic test images but from Lab -> CMYK point of view. But I realize now
it makes more sense to concentrate on the RGB -> CMYK relation since that's
where 99.9% of everyday color images originate.
Vielen dake Klaus.
How did you generate you cubes images, if I may ask? I ended up creating
mine as a mesh object in AiCS and exporting to PSD. Just curious. You can
see my RGB cubes here:
http://pages.infinit.net/graxx/device_rgb_cube_72dpi.png
Please note that I used the word "device RGB" because there are no profiles
attached -- I since discovered that the PNG does not support embedding ICC
profiles?
I know it's possible to create such test images algorithmically in
PostScript language or through Applescript. But I'm not there yet. So please
forgive any imprecision in the drawing.
BTW, did you (or anyone else) notice the banding in the Y -> G and
discontinuity in the K -> R when assigning Lstar-RGB.icc to the cube? I
wonder where they come from. In comparison, assigning AdobeRGB or sRGB or
ColorMatchRGB, among others, did not result in such visual breakage or
discontinuities despite sRGB never being as saturated as Lstar (curious why
Lstar shifts blues toward purples whereas AdobeRGB does not?). It was also
interesting (and eye opening) to assign some of the canned Epson4000 RGB and
Canon i960 profile I had on hand on my computer to the cube image as it
revealed a lot about the smoothness and saturation of the RGB -> Lab
mapping, at least within the gamut of my Eizo CG21 monitor (which I still
think highly of despite some slight non-uniformities -- it's never as bad as
some other silver models I worked on recently which I'm not going to name),
calibrated with ColorEyes and my EyeOnePro these days.
MfG,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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