Hi Graeme, this looks like a bug in xicclu, doesn't it?: xicclu -ia -fif -a /Library/ColorSync/Profiles/ISOcoated_v2_eci.icc 100 0 0100.000000 0.000000 0.000000 [Lab] -> Lut -> 0.000000 0.000000 0.028091 0.000000 [CMYK] (clip)
[Actual 94.835798 -0.287086 0.004926, deltaE 5.172178] xicclu -ia -fif -a -s100.0 /Library/ColorSync/Profiles/ISOcoated_v2_eci.icc 100 0 0100.000000 0.000000 0.000000 [Lab] -> Lut -> 0.000000 0.000000 2.809078 0.000000 [CMYK] (clip)
[Actual 88.965301 -5.498661 93.188182, deltaE 94.000197] Klaus