CGA++

CGA++ is a custom palette based on CGA's RGBI (Red, Green, Blue, Intensity) concept combined with an extension of the halved-value practice used to create CGA's brown color for a "2-level" color channel approach. By combining the four channels at full and halved values of their normal intensity under CGA, a palette of 34 = 81 total colors with 73 unique colors is produced.

Compared to EGA's "3-level" RGB approach, there are more unique colors in the full palette (73 to EGA's 64), including several more grays beyond the two which EGA inherited from CGA, but the colors are overall muddier, with medium-brightness shades suffering a lack of vibrancy. While much of the palette is shared between CGA++ and EGA, some of the more vibrant colors providing a greater range of the color wheel in EGA are replaced by "dusty" shades of other colors in CGA++.

CGA++, rather than being used as a 16-color EGA alternative (since the standard EGA palette is included and there has been no need to optimize the palette for any particular game so far), has been chosen for a full range as a useful limitation for more fully-colored game projects where a limited palette is desired for a retro feel.