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Something on my list of “things I’d like to try sometime” is using a chart measurement (perhaps taken under several different types of lighting) to estimate spectral sensitivities (based partly on “typical” camera curve shapes), and then use that to synthesize virtual samples to setup a 2.5 D cLUT. you make a 2D lookup with the 3rd dimension being either linear or at least orthogonal to the transformations in the chomatic dimensions.) 2 D or 2.5 D cLUTs are also probably desirable, since exposure in cameras is an independent variable. Which is why it really only becomes a good approach using camera spectral sensitivities, where you can synthesis as many samples covering all the surface color gamut, with the statistics that you want. The first issue is does the target chart even have enough patches to make a good LUT profile, and are the color patches of sufficient, um, spectral diversity? is this a proper description? anyway, more than just laid down using three or four inks. If anyone actually has both an IT8 and a colorchecker-24, it would be interesting to make a matrix and also a Lut profile using each and compare resulting colors to the other. That still doesn’t mean a LUT input profile is better for everyday use compared to a linear gamma matrix profile for a camera that is assumed or tested to be linear in its reponse to light. Perhaps the pigments in a colorchecker-24 chart really are so much superior to an IT8 chart that they make good LUT profiles even with only 24 patches. But it seems like an odd/iffy thing to do, even though I’m sure the author of DCamProf has carefully considered all aspects of making a camera input profile.Įxperimenting with IT8 target charts, I had to relax the LUT quite a bit to get xiccly “-fif -g” curves that looked sufficiently smooth to me, and that didn’t also create color artifacts when applied to test images. Not having a colorchecker, there’s not much I can do to test the idea of making a LUT profile using only 24 patches.
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Hmm, well, maybe 24 colorchecker patches is enough for a LUT profile if, as the dcamprof documentation says, “DCamProf will automatically relax the LUT a bit, that is prioritize smoothness over accuracy.”