offlist: this editing space debate on CS user
offlist: this editing space debate on CS user
- Subject: offlist: this editing space debate on CS user
- From: Chris Murphy <email@hidden>
- Date: Mon, 25 Nov 2002 10:20:50 -0700
Bruce writes:
In fairness to Don, the Fuji, while it has a fairly large gamut,
doesn't go anywhere near as far into the yellows and oranges as a
good sheetfed press, and it also is a tad lacking in saturated
greens. If you compare the Fuji profile with Thomas Knoll's US
Sheetfed Coated v2 in ColorThink, you'll see the fairly obvious
mismatch. If you then overlay Adobe and Don or Best RGB, you'll see
that these are exactly the areas that Don and Best include and that
Adobe clips.
I've just done some 3D modeling with ColorThink 2 comparing Adobe RGB
(1998) to both SWOP and Sheetfed Coated v2.
The model shows Adobe RGB (1998) completely containing U.S. Web Coated
(SWOP) v2. Not even a little is out of the Adobe RGB gamut. It shows a
small squeak of a slice of yellow-orange as being reproducible on U.S.
Sheetfed Coated v2, but not in Adobe RGB (1998). The model indicates
Adobe RGB is very close to the gamut boundary of Sheetfed Coated v2,
but has lots of headroom on all of the other colors. If the model is
accurate, I find it impossible to believe that an RGB editing space
bigger than Adobe RGB would provide any practical benefit.
The model is presumably based on relative colorimetric rendering. What
might this show for perceptual rendering, where the effectively gamut
volume of a device is expanded (beyond it's true gamut)? I'm not sure,
but perhaps here there would be a more noticable benefit of some other
editing space in this case, but right now I'm just not seeing it.
Chris Murphy
Color Remedies (tm)
Boulder, CO
www.colorremedies.com
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