Hello, I am using Version 1.6.1 and want to compute XYZ from spectral data with various illuminants. I tried this: spec2cie ColorCheckerSG.ti3 ColorCheckerSGillumA.cie -i A And this (the default is D50): spec2cie ColorCheckerSG.ti3 ColorCheckerSGillumA.cie In both output ti3 files the XYZ are identical, they should not be? What could be going wrong here? Secondly, is there a tool in Argyll for chromatic adaptation, to convert XYZ from on illuminant to another? Cheers, Stephen.