Lars Tore Gustavsen wrote:
Can you please tell me how far away the white point could be from one of the locus curves, before I should drop native white point calibration? I guess a lot of people can find that interesting to know.
I don't have any specific answer for this. It comes down to your preferences as to what tradeoff you want to pick, given the behaviour of your device, and in what way you want to use it. If only 8 bit LUTs are available (often the case for digitally connected displays), then any non-linear calibration curve is going to loose bits of precision that may be visible, and you have to make a choice as to what loss is acceptable vs. what the benefits are of being closer to the white locus. Typically a viewer will adapt almost completely to an emissive display device if it dominates their field of view and is in a dim surround, but (as I understand it) adaptation is more complete when the white point lies close to the black body/daylight locus. If you look at the native white of your display and are happy that it looks subjectively white to you, and you are not concerned about side by side comparisons with other image sources (such as another display or a print), then there is probably no reason to try and shift the display white point. Graeme Gill.