3.5 Representing Images and Graphics
Images such as photographs and graphics such as line drawings have common issues when it comes to their representation and compression. We first look at the general idea of representing color, then turn to the various techniques for digitizing and representing visual information.
Representing Color
Color is our perception of the various frequencies of light that reach the retinas of our eyes. Our retinas have three types of color photoreceptor cone cells that respond to different sets of frequencies. These photo-receptor categories correspond to the colors red, green, and blue. All other colors perceptible by the human eye can be made by combining various amounts of these three colors.
In a computer, ...
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