Pascal de Bruijn wrote: > I understand, however, when I use -qu instead of -qh/-qm/-ql for some targets, > the curve is totally different. And when comparing to the source image the > curve in the -qu generated profile seems to fit better. > > I'll do some more experimenting first, and possibly provide a sample > this evening. > The smoothest one would be a matrix/gamma (-aG). But without looking thoroughly at the actual data, I don't feel able to asses whether the transformation done by the camera can be modelled by a matrix/gamma or matrix/shaper reasonably well, or whether even a 3D LUT would be required. It's certainly a trade-off eventually - you need to try. Regards, Gerhard