A perceptual color space is desirable when doing many kinds of image processing. It is useful for things like:
- Turning an image grayscale, while keeping the perceived lightness the same
- Increasing the saturation of colors, while maintaining perceived hue and lightness
- Creating smooth and uniform looking transitions between colors
Unfortunately, as far as I am aware, while there are color spaces that aim to be perceptually uniform, none are without significant drawbacks when used for image processing.
For this reason I have designed a new perceptual color space, designed to be simple to use, while doing a good job at predicting perceived lightness, chroma and hue. It is called the Oklab color space, because it is an OK Lab color space.
Source: A perceptual color space for image processing, an article by Björn Ottosson.