Short for Intensity Red Green Blue, IRGB is a method of encoding sixteen unique colors in four bits. It is used in CGA and later video adapters in MS-DOS character mode. The four bits represent red, green, blue, and an intensity bit indicating an alternate brightness of the color combination. The sixteen possible colors created by IRGB encoding are listed in the following table.

Color terms, Computer acronyms, Intensity bit, RGB, Video terms

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