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Composite artifact colors is a designation commonly used to address several graphic modes of some 1970s and 1980s home computers. With some machines, when connected to an NTSC TV or monitor over composite video outputs, the video signal encoding allowed for extra colors to be displayed, by manipulating the pixel position on screen, not being limited by each machine's hardware color palette. This mode was used mainly for games, since it limited the display's horizontal resolution more than normal. It was mostly used on the IBM PC (with CGA graphics),〔http://sourceforge.net/p/ultima-exodus/wiki/CGA%20Composite/〕 TRS-80 Color Computer〔http://www.coco3.com/community/2009/02/256-color-mode-composite-mode-artifacting/〕 and Apple II〔http://nerdlypleasures.blogspot.pt/2013/09/the-overlooked-artifact-color.html〕 computers, but also possible on Atari 8-bit.〔 The limitations of composite video regarding horizontal resolution were also exploited on other systems. Adjacent pixels values got averaged horizontally, producing solid colors or generating transparency effects. On PAL displays this effect doesn't generate extra colors, as is limited to a mix of the original pixel values. If a higher resolution video connection is used, the graphics are displayed as dither patterns. Machines such as the ZX Spectrum or Mega Drive took advantage of this situation. ==Hardware support== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Composite artifact colors」の詳細全文を読む スポンサード リンク
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