Thanks Elle for the analysis, > http://ninedegreesbelow.com/temp/axf9375-nef.html > > The problem seems to be that your target shot is almost a full stop > underexposed With the stock profile I get 75% luminance in the white spot., yes, I got confused y what I had seen in the cam histogram, there where somne bright spots in the BG I assume. Anyway, that is not necessarily a profile I want to use. I want to understand how to create decent profiles for AS. > Or you could apply about a full stop's worth of positive exposure > compensation during raw processing of your target shot and reprofile. > Or reshoot the target so it doesn't need so much positive exposure > compensation. There is no way to generate an image that will be bright enough after the switch to linear. The drop is just too radical. I just re-shot the target to be as close as possible to a fully exposed white patch. After switching to linear in AS the image is severely underexposed. I need to bump it by about 2.8 stops to get back to the same exposure. But using this then as the input for the calibration process will result in a profile that leads to images that are at least a stop underexposed. With a bit of trial and error, I generated a profile from a linear image that was bumped up by 1.8 stops that led to a profile that then produced a similar luminance on the white spot as the original image with the stock profile. I am currently on a crappy laptop screen so I really can't judge colors but the first impression is sort of ok. cheers afx -- http://afximages.com/