I have not yet received any response related to this topic. I am pleased to report that I was able to use lcms with the sample profiles to obtain results which are very similar to results obtained using my own implementation of the transform. Perhaps the D50 is only a LAB-space thingy which does not alter the final result.

Bob

On Sat, 12 Nov 2005, Bob Friesenhahn wrote:

The lcms profiles collection provides some Rec.601 and Rec.709 YCbCr to LAB profiles. These have a whitepoint of D50 while Rec.601 and Rec.709 use D65 as their native whitepoint.

Can these existing profiles be used to perform a proper conversion from Rec.601/Rec.709 YCbCr to RGB (e.g. sRGB) even though they are claimed D50 rather than D65?

Do any profiles exist for Rec.601/Rec.709 which are for the equivalent RGB rather than YCbCr? What is necessary in order to create such a profile?

Bob
======================================
Bob Friesenhahn
[EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/


======================================
Bob Friesenhahn
[EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/


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