Really? Wow, that comes as a huge surprise since I’ve always used the offsets to calibrate my own RS20. No problems achieving a lovely flat greyscale this way either. So, I mean, what’s up with the offsets? Should I recalibrate by tweaking the gamma only if I’m already getting a flat greyscale this way? (I should explain that I’ve always subtracted with the offsets – never raised them above 0 as I read this affected the black level.)