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It's a good point, I wasn't precise in my language. A good way to understand it is that if two different colors have the same lightness (or hue, or saturation)
by raphlinus 6y ago
It's a good point, I wasn't precise in my language. A good way to understand it is that if two different colors have the same lightness (or hue, or saturation) in some color space, that "predicts" that they will be perceived to have the same lightness as well. It's impossible to get these predictions exactly right (in part because actual perception depends on so many variables), but some can be better than others.
Another useful function of a color space is to predict the threshold of when two similar colors are just barely perceptibly different.
- kelsolaar 6y ago> Another useful function of a “perceptually uniform” colorspace. Not all the colourspaces are perceptually uniform nor try to be. For example, CIE XYZ is photometrically linear and appropriately so!
- jacobolus 6y agoXYZ does not provide correlates of hue, lightness, brightness, chroma, colorfulness, saturation, blueness–yellowness, redness–greenness, or the like Y = relative luminance, XYZ are tristimulus coordinates, and x, y or u', v' are chromaticity coordinates. These are all physical rather than perceptual quantities.
- roel_v 6y agoI'm a bit lost in the discussion here - is your first line a correction of the GP and you used the > mark 'wrong', or did the GP update his post and is the quote not in there any more?
- raphlinus 6y agoThe first. I should have added "perceptually uniform," kelsolaar is correct.
- rodarmor 6y agoThat makes sense, thank you!