To construct a Color data structure, you must specify a color space. The coordinates of each color space are floats between 0 and 1 unless noted. The known color spaces are:

RGB - Red Green Blue - hardware dependent additive color space

CMYK - Cyan Magenta Yellow Key - hardware dependent subtractive color space

HSV - Hue Saturation Value - hardware dependent cylindrical color space

XYZ - CIE 1931 color space modeling retinal stimulus response

xyY - CIE 1931 color space combining chromacity (x,y) with retinal stimulus

Lab - Lightness a-chroma b-chroma -CIE 1976 color space with Euclidean distance modeling perceptual distance, a is a green to magenta coordinate, while b is a blue to yellow coordinate

Luv - Lightness u-chroma v-chroma - alternate CIE 1976 color space with Euclidean distance modeling perceptual distance, u is a green to magenta coordinate, while v is a blue to yellow coordinate

LCHab - Lightness Chroma Hue - CIE 1976 cylindrical color system with a and b rewritten in polar coordinates with radius C (chroma) and angle H (hue)

LCHuv - Lightness Chroma Hue - CIE 1976 cylindrical color system with u and v rewritten in polar coordinates with radius C (chroma) and angle H (hue)