Hello Gerhard On 27-Jan-2011, Gerhard Fürnkranz wrote: > I may be wrong, but I have the feeling that the reverse lookups are > significantly faster for in-gamut color than for out of gamut colors. IMO > collink's LUT creation phase slows down as well when using e.g. -ir instead > of -ip, i.e. when a larger number of the colors need to be clipped. Wow! You're right, just checked! Creating a devicelink profile with -r51 -ip took about 7 minutes here, while the same thing with -ir is still at 2% after 30 minutes! Graeme, are you sure isn't there some subtle bug you never noticed ? How is that clipped out of gamut colors cause a so big waste of time and resources ? If so, then think what happens with colprof: even using -ip there are LOTS (the majority ?) of points in the Lab/XYZ B2A table corresponding to clipped colors slowing down things terribly - since the source gamut used for gamut mapping will NEVER cover the entire Lab/XYZ space! Points that after all will never be used, possibly... If I'm reasoning correctly, of course... /&