Linked from
The 51 pages that link to Color space, each with the reason it gives.
Color mixingNarrower topic: It provides a framework for describing mixture results quantitatively.
ChromaticityNarrower topic: Chromaticity is expressed within color spaces such as CIE XYZ and xyY.
RedNarrower topic: Different color spaces specify red in different ways.
HSL and HSVNarrower topic: HSL and HSV are coordinate systems derived from the RGB color space.
CIELUVNarrower topic: CIELUV is one model used to specify, compare, and transform colors.
ISCC–NBS systemNarrower topic: Its numerical side depends on representing colors as coordinates.
Spring greenNarrower topic: The meaning of a color value depends on its specified color space.