Graham, I've done a test which I have posted on Luminous Landscape, here: http://www.luminous-landscape.com/forum/index.php?topic=95251.msg782782#msg7 82782 I would appreciate you having a look at this post as the results are not what I would have expected (actually, they are the opposite of what I expected). Could be that I'm confused. Here are the commands I used for standard D50 illuminant, D65-Fluorescent illuminant, D65-Fluorescent illuminant with FWA compensation: colprof -v -ACanon -MiPF6400 -Dprofile -qh -SBetaRGB.icc -cmd -dpe -Oprofile.icc profile colprof -v -ACanon -MiPF6400 -iprofile-D65-Fluorescent.sp -fprofile-D65-Fluorescent.sp -Dprofile-D65-Fluorescent-FWA -qh -SBetaRGB.icc -cmd -dpe -Oprofile-D65-Fluorescent-FWA.icc profile colprof -v -ACanon -MiPF6400 -iprofile-D65-Fluorescent.sp -Dprofile-D65-Fluorescent -qh -SBetaRGB.icc -cmd -dpe -Oprofile-D65-Fluorescent.icc profile Thanks Robert