Am 06.02.2013 12:37, schrieb Graeme Gill:
Maybe something could be done before profiling by evaluating how additive the sample set is
Hi Graeme, in case of tri-chromatic readings (with colorimeter) the only way coming into my mind is attempting to fit a matrix/TRC model to the data. With spectral readings, the additivity of the _emitted spectra_ can be verified easily, but the display electronics could unfortunately still introduce some non-linear interdependencies between the RGB channels (maybe even intentionally, for "color correction" purposes, which certainly would not make profiling easier), so that the whole monitor may still not appear as additive, even if it's panel is additive.
One quandary is that in the ICC way of doing things, you can only have the (baked in) gamut mapping with cLUT type profiles. Use of matrix profiles tends to imply gamut per component clipping, which is not very elegant.
Some limited perceptual mapping (e.g. adjust gamma in order to account for viewing conditions, black point mapping, desaturate colors via the matrix if the display can't reproduce satured colors) could be basically done with a matrix profile as well, but this would be a non-standard profile then, since matix profiles are colorimetric by definiton. Best Regards, Gerhard