The perception of screen colours also might depend on pre-conditioning of the rods and cones.
I find that the lighting of my ereader appears white to me if I read on it after having spent some time reading a physical book with yellowed pages, even without a side-by-side comparison. Whereas if I spend time reading a newer physical book with glossy white alkaline paper, and then read on my ereader, the lighting appears yellow.
From this entirely unscientific experience, I hypothesise that there must be a scientific basis to different people 'objectively' perceiving screen colours differently based on what they have been viewing for a significant period of time prior to looking at the same screen.
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