List of Monochrome and RGB Palettes - Non-regular RGB Palettes - 4-bit RGBI

4-bit RGBI

The 4-bit RGBI palette is similar to the 3-bit RGB palette but adds one bit for intensity. This results in each of the colors of the 3-bit palette to have a dark and bright variant giving a total of 23×2 = 16 colors.

This 4-bits RGBI schema is used in several platforms with variations, so the table given below is a simple reference for the palette richness, and not an actual implemented palette. For this reason, no numbers are assigned to each color, and color order is arbitrary.

The 4-bits RGBI palettes are used by:

• Color Graphics Adapter (on the IBM PC and compatibles, with brown instead of dark yellow)
• EGA, VGA and Microsoft Windows as their default 16-color CGA-compatible palette. (Dark yellow had a reduced green level and thus was brown instead of the ochre shown above.)
• MOS Technology VDC (on the Commodore 128)
• ZX Spectrum (with two black, black with bright is the same as black without bright)
• TI 99/4A / MSX (These use the TMS9918 video chip. The colors do not conform to the image above, but has instead: transparency, black, medium green, light green, dark blue, dark purple, brown, cyan, dark red, orange, dark yellow, light yellow, dark green, medium purple, gray, and white.)