Stephen T wrote: I am hoping that photographing the IT8.7/2 target under fluorescent light might improve the results. Would I then still profile against the D50 reference data or use one of the alternatives? I have chart reference data also for F2, F7 and F11 illuminants. What are these used for? I had the same question abot mine Digital Color Checker SG. And my experience that D50 reference data are better. If You choose another reference for the profile, after applying the profile You'll get the images of objects like You see them under this reference illuminant. But in most of the cases the objects on images should look like them illuminated by D50. So the D50 reference data will be correct.