| Color Image |
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| CATEGORIES ABOUT COLOR IMAGE | |
| computer graphics | |
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For visually acceptable results, it is necessary (and almost sufficient) to provide three Sample s (''color channels'') for each pixel, which are interpreted as coordinates in some color space. The RGB color space is commonly used in computer displays, but other spaces such as YUV , HSV , and are often used in other contexts. COLOR IMAGE REPRESENTATION A color image is usually stored in memory as a Raster Map , a two-dimensional array of small integer triplets; or (rarely) as three separate raster maps, one for each channel. Eight bits per sample (24 bits per pixel) seem to be adequate for most uses, but faint Banding Artifact s may still be visible in some smoothly varying images -- especially those which have been subject to Processing . Particularly demanding applications may use 10 bits per sample or more. On the other hand, some widely used Image File Format s and Graphics Card s may use only 8 bits ''per pixel'' -- i.e. only 256 different colors, or 2--3 bits per channel. Converting continuous-tone images like photographs to such formats requires Dithering and yields rather grainy and fuzzy results. Graphics cards that support 16 bits per pixel provide 65536 distinct colors, or 5--6 bits per channel. This resolution seems to be satisfactory for non-professional uses, even without dithering. |
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