![]() Light varies in wavelengths, which our eyes and brain interpret as varying colors, and also in intensity. Light enters the eyes, is processed by light receptors ( cones and rods), and sent via the optic nerves to the brain for further processing and interpretation. Rather color is part of how we sense the world around us. On the other hand, color isn't out there in the world in the same tangible way that light is. On the one hand, light comes from the sun or other radiant sources, and is refracted by mediums (water, the atmosphere, glass) and diffusely or specularly reflected by surfaces. Nominal ranges are often extended in practice. RGB numbers have the nominal range 0 to 1, as does Y from XYZ and xyY. ![]()
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