LAB
In contrast to the device-dependent colour spaces RGB or CMYK, the CIELab colour space describes colour objectively, i.e. the colour values are thus clearly and unmistakably defined. The Lab color space separates the brightness (L) from the two color coordinates a- (red-green) and b-axis (yellow-blue). In addition, this color space includes all color impressions perceptible by the human eye, which are represented in it with approximately equal visual distance. An equal distance between two points results in a nearly equal sensation for the color difference of these two colors everywhere in this color space.