A Colorspace is a way to define a color. The two main types/groups are RGB and YUV.
here is a list of colorspaces:
Under http://www.easyrgb.com/math.php is a huge list of Colorspace conversion formulas.
Standardization of Colors:
- INTERNATIONAL COMMISSION ON ILLUMINATION (CIE) http://www.cie.co.at/cie/
Division 1: Vision and Colour Division 2: Measurement of Light and Radiation Division 3: Interior Environment and Lighting Design Division 4: Lighting and Signalling for Transport Division 5: Exterior Lighting and Other Applications Division 6: Photobiology and Photochemistry Division 8: Image Technology
- INTERNATIONAL COLOR CONSORTIUM (ICC) http://www.color.org/
color management (eg. the same color on every system PC, Mac, UNIX, Linux, DVD Players, ...)