Hello Graeme! I found small discrepancy in spec2cie in ArgyllCMS v.1.2.1.Lets say, I have Test.TI3 with spectrals and CIE values. And these values are different under D50.
If I need to convert spectrals to CIE under D50 illumination, then it's supposed to use: spec2cie.exe -i D50 -o 1931_2 -n Test.ti3 Test_CIE.ti3, isn't it? (with "-n" option).
In ArgyllCMS v.1.1.1 it works in such manner.But in ArgyllCMS v.1.2.1 it seems to me that it takes CIE values from input file and just copy to output file. To make spectral to CIE convertion it's necessary to use command without "-n" option, i.e.:
spec2cie.exe -i D50 -o 1931_2 Test.ti3 Test_CIE.ti3 Best regards, Alexey Gribunin, UNIT Color Technologies, Moscow, Russia.