1. What is color?

1.1 Definitions

Color is a concept that everyone understands. The Dictionnaire Universel Francophone [1] gives the following definitions: "it is an impression produced on the eye by the various constituent radiations of light", or "a body appears colored because it diffuses and reflects only part of the white light it receives, or because it itself emits light if brought to a sufficient temperature".

Color is therefore a perceptual attribute that seems to us to be a characteristic of the observed object. However, this is not the case. If it is indeed a perceptual attribute, it is conceived in the visual system made up of the eye and the visual cortex....

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