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Lexikon


gamma correction


Adjustments applied during the display of a digital representation of colour on a screen in order to compensate for the fact that the href="module.php?name=Lexikon&file=search&eid=1&query=Cathode Ray Tubes">Cathode Ray Tubes used in computer href="module.php?name=Lexikon&file=search&eid=1&query=monitors">monitors (and televisions) produce a light intensity which is not proportional to the input href="module.php?name=Lexikon&file=search&eid=1&query=voltage">voltage. The light intensity is actually proportional to the input voltage raised to the inverse power of some constant, called gamma. Its value varies from one display to another, but is usually around 2.5. Because it is more intuitive for the colour components (red, green and blue) to be varied linearly in the computer, the actual voltages sent to the monitor by the href="module.php?name=Lexikon&file=search&eid=1&query=display hardware">display hardware must be adjusted in order to make the colour component intensity on the screen proportional to the value stored in the computer' s href="module.php?name=Lexikon&file=search&eid=1&query=display memory">display memory. This process is most easily achieved by a dedicated module in the display hardware which simply scales the outputs of the href="module.php?name=Lexikon&file=search&eid=1&query=display memory">display memory before sending them to the href="module.php?name=Lexikon&file=search&eid=1&query=digital-to-analogue converters">digital-to-analogue converters. More expensive href="module.php?name=Lexikon&file=search&eid=1&query=graphics cards">graphics cards and href="module.php?name=Lexikon&file=search&eid=1&query=workstations">workstations (particularly those used for href="module.php?name=Lexikon&file=search&eid=1&query=CAD">CAD applications) will have a gamma correction facility. In combination with the "href="module.php?name=Lexikon&file=search&eid=1&query=white-point">white-point" gamma correction is used to achieve precise colour matching. {Robert Berger' s explanation of monitor gamma (http://www.cs.cmu.edu/afs/cs.cmu.edu/user/rwb/www/gamma.html)}. [{"Digital Imaging in C and the World Wide Web", W. David Schwaderer (http://www.itknowledge.com/)}]. (1999-02-01)

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href="module.php?name=Lexikon&op=content&tid=2247">co ] [ href="module.php?name=Lexikon&op=content&tid=2322">colour ] [ href="module.php?name=Lexikon&op=content&tid=2330">com ] [ href="module.php?name=Lexikon&op=content&tid=2332">combination ] [ href="module.php?name=Lexikon&op=content&tid=2457">component ] [ href="module.php?name=Lexikon&op=content&tid=2491">computer ] [ href="module.php?name=Lexikon&op=content&tid=2545">con ] [ href="module.php?name=Lexikon&op=content&tid=2606">cons ] [ href="module.php?name=Lexikon&op=content&tid=2791">cr ] [ href="module.php?name=Lexikon&op=content&tid=2900">cu ] [ href="module.php?name=Lexikon&op=content&tid=2976">D ] [ href="module.php?name=Lexikon&op=content&tid=3151">de ] [ href="module.php?name=Lexikon&op=content&tid=3384">digit ] [ href="module.php?name=Lexikon&op=content&tid=3385">Digital ] [ href="module.php?name=Lexikon&op=content&tid=3386">digital ] [ href="module.php?name=Lexikon&op=content&tid=3436">ding ] [ 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href="module.php?name=Lexikon&op=content&tid=10364">rc ] [ href="module.php?name=Lexikon&op=content&tid=10385">re ] [ href="module.php?name=Lexikon&op=content&tid=10754">rl ] [ href="module.php?name=Lexikon&op=content&tid=10767">ro ] [ href="module.php?name=Lexikon&op=content&tid=10914">rw ] [ href="module.php?name=Lexikon&op=content&tid=10918">S ] [ href="module.php?name=Lexikon&op=content&tid=10922">sa ] [ href="module.php?name=Lexikon&op=content&tid=11010">sc ] [ href="module.php?name=Lexikon&op=content&tid=11086">screen ] [ href="module.php?name=Lexikon&op=content&tid=11150">se ] [ href="module.php?name=Lexikon&op=content&tid=11376">si ] [ href="module.php?name=Lexikon&op=content&tid=11506">sit ] [ href="module.php?name=Lexikon&op=content&tid=11651">so ] [ href="module.php?name=Lexikon&op=content&tid=11934">st ] [ href="module.php?name=Lexikon&op=content&tid=12068">store ] [ href="module.php?name=Lexikon&op=content&tid=12133">su ] [ href="module.php?name=Lexikon&op=content&tid=12359">T ] [ href="module.php?name=Lexikon&op=content&tid=12380">tag ] [ href="module.php?name=Lexikon&op=content&tid=12440">tc ] [ href="module.php?name=Lexikon&op=content&tid=12503">television ] [ href="module.php?name=Lexikon&op=content&tid=12588">th ] [ href="module.php?name=Lexikon&op=content&tid=12692">tk ] [ href="module.php?name=Lexikon&op=content&tid=12708">tm ] [ href="module.php?name=Lexikon&op=content&tid=12721">to ] [ href="module.php?name=Lexikon&op=content&tid=12777">tp ] [ href="module.php?name=Lexikon&op=content&tid=12896">tt ] [ href="module.php?name=Lexikon&op=content&tid=12986">ua ] [ href="module.php?name=Lexikon&op=content&tid=13175">us ] [ href="module.php?name=Lexikon&op=content&tid=13188">user ] [ href="module.php?name=Lexikon&op=content&tid=13252">va ] [ href="module.php?name=Lexikon&op=content&tid=13260">value ] [ href="module.php?name=Lexikon&op=content&tid=13274">var ] [ href="module.php?name=Lexikon&op=content&tid=13310">ve ] [ href="module.php?name=Lexikon&op=content&tid=13366">vi ] [ href="module.php?name=Lexikon&op=content&tid=13500">voltage ] [ href="module.php?name=Lexikon&op=content&tid=13618">wb ] [ href="module.php?name=Lexikon&op=content&tid=13632">Web ] [ href="module.php?name=Lexikon&op=content&tid=13841">workstation ]






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