What is perceptually uniform color space and how LAB color space is perceptually uniform? [closed]

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What is perceptually uniform color space ? how Lab color space is perceptually uniform and device independent?

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slhck is right: a perceptual uniform color space ensures that the difference between two colors (as perceived by the human eye) is proportional to the Euclidian distance within the given color space. Lab was created to satisfy the perceptual uniformity property.

However, this property is satisfied only locally. For distant colors, the perceived difference is no more in accordance with the Euclidian distance. Therefore, new distances were defined, such as deltaE, CIE76, CIE94, CIE2000 in order to satisfy both local and global perceptual uniformity.