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What is colour or color?
Colour (British English), or Color (American English), is the sense of any object that may be described in terms of hue, lightness, and saturation. Vision is obviously involved in the perception of colour, which is described through color categories, with names such as red, green, yellow, orange, blue, or purple.
In physics, color is specifically associated with electromagnetic radiation of a certain range of wavelengths visible to the human eye.
This perception of color is received from the stimulation of photoreceptor cells (in particular cone cells in the human eye and other vertebrate eyes) by electromagnetic radiation (in the visible spectrum in the case of humans).
An object appears coloured because of its categories and physical specifications associated with objects through the wavelengths of the light that is reflected from them and their intensities. This reflection is governed by the object's physical properties such as light absorption, emission spectra, etc.
Also, the color of an object depends on both the physics of the object in its environment and the characteristics of the perceiving eye and brain.
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