What is RGB?
| Primary Colors Red Green Blue |
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Used to describe a computer monitor which has three electron guns, one for each colour. Since each gun can be on or off, a maximum of eight Colors (counting black as a colour) can be obtained, A variation on this is the RGBI system, where 'I' stands for 'intensity' and means that the brightness of each gun can be switched to half, thus nearly doubling the colour range. RGB monitors may be contrasted with 'analogue' types, where the brightness of the electron beam produced by each gun is proportional to the size of voltage applied to it, giving an infinite colour range. RGB is often used in color coding on web pages, particularly for GIF files. 64K color values can be represented by a byte (8 bits of data) each for red, green, and blue. These are commonly expressed in hexadecimal values from 00 to FF for each color. The color value for white in this system is FFFFFF, where each color is at maximum value. Red is FF0000. Yellow is FFFF00. There is a smaller set of non-dithering colors where the permissible values for each color are hexadecimal 00, 33, 66, 99, CC or FF or decimal 0, 51, 102, 153, 204, and 255 and the results will look the same with different browsers, computers, and color cards. See the article, Creating Small, Fast-Loading Graphics for Web Pages for a further explanation. |
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