Hello Graeme! My OS is Windows Vista 32b. I've got a crash of the colprof when do: colprof -v -S"sRGB.icm" -cpcd -dpp -P -Tla ... The colprof crashes at saturation gamut mapping step without any message. I'm understood that the using -S key with any -t or -T keys isn't correct. IMHO, there should be an appropriate message in colprof for such user mistakes. Best regards, Nikolay.