RelCol vs AbsCol, v2 vs v4, was: Chris Murphy vs Bruce Fraser
RelCol vs AbsCol, v2 vs v4, was: Chris Murphy vs Bruce Fraser
- Subject: RelCol vs AbsCol, v2 vs v4, was: Chris Murphy vs Bruce Fraser
- From: Chris Murphy <email@hidden>
- Date: Tue, 18 Jul 2006 21:09:01 -0600
Test image:
RGB, Source = sRGB IEC61966-2.1
Filled with white space, small selection filled with RGB 0,0,255
Convert to Destination= U.S. Web Coated (SWOP) v2
1. Photoshop CS using RelCol + BPC
White: 0,0,0,0
Blue: 88,77,0,0
2. Photoshop CS using AbsCol
White 5,1,0,0
Blue: 93,72,0,0
3. Photoshop CS2 using RelColr + BPC
White: 0,0,0,0
Blue: 88,77,0,0
4. Photoshop CS2 using AbsCol
White: 1,0,0,0
Blue: 92,72,0,0
5. Mac OS X 10.4.7 AppleScript using same profiles as above, RelCol
White: 0,0,0,0
Blue:93,79,0,0
6. Mac OS X 10.4.7 AppleScript using same profiles as above, AbsCol
White:5,1,0,0
Blue:94,72,0,0
7. Mac OS X 10.4.7 AppleScript using a candidate ICC v4 sRGB as
source, RelCol
White:0,0,0,0
Blue:90,78,0,0
8. Mac OS X 10.4.7 AppleScript using a candidate ICC v4 sRGB as
source, AbsCol
White:0,0,0,0
Blue:90,71,0,0
In all cases there is a difference between RelCol and AbsCol. The
"scum dot" of 1% cyan in #4 I think is a bug. Photoshop CS2 is in
effect treating v2 display profiles as though they are v4 display
profiles with respect to the wtpt tag.
Chris Murphy
Color Remedies (TM)
www.colorremedies.com/realworldcolor
---------------------------------------------------------
Co-author "Real World Color Management, 2nd Ed"
Published by PeachPit Press (ISBN 0-321-26722-2)
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