Color Spaces
There are many ways to describe color
- Spectrum
- allows any radiation (visible or invisible) to be described
- usually unnecessary and impractical
- RGB
- convenient for display (CRT uses red, green, and blue phosphors)
- not very intuitive
- HSV
- an intuitive color space
- H is hue - what color is it? S is saturation or purity - how non-gray is it? V is value - how bright is it?
- H is cyclic therefore it is a non-linear transformation of RGB
- CIE XYZ
- a linear transform of RGB used by color scientists
For the very best performance four spectrum samples are used; three is usually enough