"Gerhard Fürnkranz" wrote: > I'm wondering whether the sensor sensitivities of "traditional" instruments > could be possibly > estimated, given the CRT and LCD matrices stored in the instruments and > spectral samples for the > corresponding display types? [Aren't "generic" CRT and LCD samples included > in the i1 Display > pro software?] It's certainly an ill-posed problem which needs to be > constrained/regularized, > e.g. by assuming some a priori knowledge like for instance shape of the > sensitivities similar to > standard observer CMFs, smoothness, positivity, unimodality, etc. Hi Gerhard, the cleverest idea I had in this direction, was to measure the spectral sensitivities of one or more of each conventional colorimeters, and save that as a reference along with the corresponding calibration matrix. Given an instance of a colorimeter of the same type, the approach would be to compute a correction matrix that transforms the reference calibration matrix to the instrument matrix, and apply that to the reference instruments spectral sensitivity curves, to give an approximate set of curves specific to that instance, and then use that with the CCSS files to compute a calibration for a particular type of display. The sticking point of course is being able to measure the spectral sensitivities of the colorimeters. I certainly don't have the equipment to do that at this point in time, but in theory it just has to be done once for each type of colorimeter (although I'm sure some advantage could be taken of measuring more than one of each type). Some additional accuracy could probably be gained by determining a set of CRT and LCD spectra that best explain the reference colorimeter calibration matrices, and then using that with both calibration matrices to better estimated the non-reference colorimeter spectral curves. With the colorimeter response depending so critically on the interaction between it's spectral sensitivity curves and the (typically) narrow peaks in display device spectral output, I'm in some doubt that sensitivity curves of any merit can be estimated without actually measuring an instrument ? cheers, Graeme.