The human eye contains receptors for just three colors of light: red, green, and
ID: 2154299 • Letter: T
Question
The human eye contains receptors for just three colors of light: red, green, and blue. All the colors we perceive in the world are mixed in our brains from different proportions of these three primary colors.Computer and video display screens, both CRTs and flat panels, take advantage of this fact by using color-generating elements of the same three colors to create the appearance of any imaginable color. An image on the screen is built of tiny dots of color called picture elements, or "pixels". (By default, the period at the end of this sentence consists of just one black pixel.) Each pixel has three different color levels associated with it, one level for each of red, green, and blue, with integer values from 0 (representing no color), to 255 (representing the brightest level of a color). For example, (R, G, B) = (255, 0, 0) represents the brightest pure red, (170, 170, 0) represents an equal mixture of red and green, without any blue, which comes out a sort of dark yellow, and (127, 127, 127) represents an equal mixture of all three primary colors, each one at half its maximum intensity: a color sometimes called "50% gray".
(a) If black is the "color" corresponding to a lack of visible light, what are the RGB values of a black pixel? (b) If white is the "color" corresponding to the brightest possible equal mixture of all colors, what are the RGB values of a white pixel? (c) How many different colors can a pixel be? (The answer is large, but enter it as a whole number.)
Explanation / Answer
a) (0,0,0) b) (255,255,255) c) 256^3 = 16777216
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