[argyllcms] Re: Question regarding White Point and spotread
- From: <robert@xxxxxxxxxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Tue, 4 Nov 2014 22:51:53 -0000
FYI Brad,
Here is a new test with the Photoshop color setting to Absolute:
Beta RGB: 20, 10, -11 6452, 1299, -1374 6452, 1299, -1374
Absolute: 20, 10, -11 6460, 1308, -1374 6420, 1305, -1382
Relative: 19, 10, -11 6235, 1300, -1348 6194, 1296, -1358
Relative+BPC: 20, 9, -10 6615, 1182, -1332 6611, 1213, -1276
The first row are the 8 and 16-bit Lab values in BetaRGB.
The first set of 16-bit values are using Microsoft ICM, the second set Adobe
ACE. The 8-bit values are the same for both CMMs.
It's not possible to enter a color in 16-bit unfortunately.
I'm a bit surprised to find the BPC altering the 'a' value so much (looking
at the 16-bit values). ICM is worse than ACE here. I would have thought BPC
would alter the 'L' value and not the 'a' and 'b' values.
Robert
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