Color (in Arabic : لون): is what you see when you modify the pigments so that light physically seen by the human eye (called the response) and translated in the brain (called the process) .The human eye has three color receptors, respectively sensitive to red, green and blue. A color can be defined by three components. We can use the rate of red, green and blue, which corresponds to the system Red Green Blue (RGB). It is used for example in computer science but remains far from our natural perception of colors.