The Lab colour space

Colour information related to the human eye is represented in the L*a*b colour space (aka CIELAB or CIEL*a*b), in which all perceptible colours are depicted ¹. The fact that this colour space is device-independent also means it is lossless. It can be used to convert a colour that from one particular colour system into another colour system. The colour conversion algorithms of industry-standard software such as Adobe Photoshop are based on this ability as well. It is used when colours are depicted in the colour picker.

Jan-Peter Homann, Digital Color Management: Principles and Strategies for the Standardized Print Production (Springer Science & Business Media, 2008), 151.

The CIE Yxy colour model

The CIE Yxy colour model was determined in 1931 by the Commision International de l’Eclairage to be kind of a colour triangle 1, which is often called “horse shoe” because of it’s charismatic form. The two-dimensional surface includes all perceptible colours, with the saturated colours being positioned along the outer line, the centre of the surface contained the less saturated colours, with the white point of the colour space being in the middle. Each colour has a certain point assigned to it in the coordinate system. What is problematic with this representation is the fact that distances between the colours do not correspond to the distances perceived by the eye, and that the brightness of a colour is completely disregarded.

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