I don’t think that’s true. I posted a long reply about what’s going on over in the previous thread (Input color profile to use for negatives - #13 by NateWeatherly), but essentially it’s that 6500k (ish) light emitted by an iPad screen is nothing like D65 daylight used to profile cameras. The iPad is an excellent light source for scanning negatives (better than flash, tungsten, or any “white” LED panel) but when you start using narrow band RGB light sources normal camera profiles will result in extreme saturation and clipping, especially when inverted. Camera profiles can only deal with color, they don’t work when you’re using narrow band illumination to make your camera into a sort of densitometer.
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