Thank you Marti - that was fast.
> -----Original Message----- > From: marti.ma...@littlecms.com [mailto:marti.ma...@littlecms.com] > Sent: 31. oktober 2014 02:57 > To: Esben Høgh-Rasmussen Myosotis > Cc: Lcms-user@lists.sourceforge.net > Subject: Re: [Lcms-user] Chromatic adaptation using the Bradford method > > > Ok, I've checked this with Phil Green, the ICC technical secretary and > with Ronnie Luo, who most of you already know. > > The typo is in Lam's paper. The reference Phil gives is Hunt, R. W. G. > 'Reversing the Bradford chromatic adaptation transform', Colour Research > and Application 22 pp355-356, and this gives the same value as that used > in the ICC spec. Ronnie corroborates the coefficients in the last row > should add to 1.0. > > Regards > Marti I must admit that I still feel somewhat uncomfortable that the original source should have the typo. I did notice the odd sum, but I don't see any good reason it would have to be anything in particular. Is the matrix ever used for other purposes than to derive an adaptation matrix? As long as the matrix is always used in the equation inv(A)*D*A, where D is a diagonal matrix, then rows can be scaled arbitrarily, right? Of course it can still be nice to use some kind of normalization. Esben H-R Myosotis Software Engineer ------------------------------------------------------------------------------ _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
