2004.08.12 23:05 "Re: [Tiff] From bmp to Tiff", by Bob Friesenhahn

Yes, well, even I agree with Bob. I mean, I cannot see any real difference in quality when the same algorithm is applied to RGB or CIE L*a*b*. The quality and the correctness of the algorithm, itself, is far more important, for sure.

This is why, nevertheless, I said what I did, and still stand by it:

• It is theoretically more correct to do in with L*a*b*. I believe apps like

[ remainder of thesis removed ]

You talk quite a bit about theory, but there are many layers to this onion, so what seems theoretically correct may not result in a visible difference, or may be in fact theoretically incorrect because yet another factor was ignored.

I find this discussion to be interesting, but libtiff is just about moving bits in and out of a file format so I think that there is a much better place to carry on this discussion. The much better place is the mailing list for lcms (http://www.littlecms.com/) which is an open source package which makes the the theoretically possible actually possible for the rest of us. You will find other similar-minded people there.

I expect that you will also find information on Bruce Lindbloom's site (http://www.brucelindbloom.com/) to be quite interesting. Particularly his analysis of RGB working spaces and his Beta RGB profile.

Bob

======================================
Bob Friesenhahn
bfriesen@simple.dallas.tx.us
http://www.simplesystems.org/users/bfriesen