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The Book of GIMP by Karine Delvare, Olivier Lecarme

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A.3 Color Representation

In nature, things are either translucent, reflective, or opaque, and they have a unique hue. Here’s a simple explanation of color: When sunlight strikes an object, the object absorbs a part of the solar spectrum and reflects the rest back at the viewer. The color that the object does not absorb—the color it reflects—is the color that you see. But not all of the visible light that we see comes from the sun. Lightning, fire, and phosphorescent organisms all produce their own light. Additionally, many other natural phenomena lead to visible color.

How Colors Are Produced

Color can be generated in the following ways:

  • Color by refraction: When light passes through a refractive material, it is split in a pattern that depends on ...

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