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The science of color is sometimes called chromatics , colorimetry , or simply color science . It includes the perception of color by the human eye and brain, the origin of color in materials, color theory in art , and the physics of electromagnetic radiation in the visible range (that is, what is commonly referred to simply as light ).
When you are describing the colour of something, you don't normally use the word colour . Don't say, for example, ' He wore a green colour tie '. You say 'He wore a green tie'.
Colour or color  is a property of light as seen by people. The British spelling of the word is colour , the word color is used in American English .