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I have a blue/black (or possibly white/gold) dress that says it's relative.

You can also ask a UI designer about "absolute" colors. One color needs to be different depending on the context it's in order to LOOK the same (it's size/thickness, background, what it's next to).

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The blue black dress thing is how people perceive it, but the values for pixels are absolute. The pixel values aren’t changing from viewer to viewer.

If OP had said “perceived color”, I would agree. But we’re talking at pixel level here.

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