On 12.08.2010 12:52, Rupert Weber wrote: > Thanks a lot for all the input. > > I have been using the matrices from > http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html *) > and thought I was doing sRGB/D65-to-Lab or sRGB/D50-to-Lab. > But as I understand now, I was actually doing sRGB-to-Lab/D65 or /D50; > while all the RGB spaces like AdobeRGB or sRGB have their own fixed > implicit reference white. > Correct? if you took gamma into account, then yes. > *) This is where the matrix used by babl and the Decompose plug-in is > listed as "PAL/SECAM") Never heard about that one, but that doesn't mean much :-) > As to babl and the Decompose plug-in: They should be updated to use sRGB > conversion? Regarding BABL: i've had a look at extensions/CIE.c and found conversion routines using linear light RGB with the sRGB primaries and white point -- that is scRGB. Everything fine here. Now i'm not familier with BABL -- possibly i've checked at the wrong routines? Regarding the Decompose plug-in: yes, that seems to use the PAL stuff. However, i'd be surprised if that makes a really big difference. What's more important, is that i couldn't find any routine which respects the gamma curve defined by sRGB. regards, yahvuu _______________________________________________ Gimp-developer mailing list Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
