What are color models?
Colorimetry and photometry are sciences dealing with somehow complex concepts and vocabulary. But it is not necessary for our purpose to understand what exactly are luminance, lightness, brightness or chromaticity and purists may object that I will sometimes use words with a meaning which does not exactly match the official definitions. You must just know that there are several conventional systems to quantify the distribution of colors in an image. These systems are named color models, or colorspaces. According to the technique used to create or reproduce the images it is necessary to choose the model which best fits the characteristics or limits of the technique. A minimum knowledge in this domain is useful to master the use of colors in fractal images. For more information • Frequently Asked Questions about Color http://www.inforamp.net/~poynton/ColorFAQ.
