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Colour Models
A colour model is an abstract mathematical model describing the way colours can be represented as tuples of numbers (triples in RGB, quadruples in CMYK).
A colour model without a mapping function to a Colour Space is a more or less arbitrary colour system with no globally understood system of colour interpretation. Adding a mapping function between a colour model and a reference colour space establishes a definite footprint within the reference colour space, known as Gamut.
Examples:
- CIE 1931 RGB
- HSL
Generally, CIE 1931 Colour Spaces are used as reference models for specifying colour models.