Extra Half-Brite, usually abbreviated as EHB, is a planar display mode of the

Amiga Amiga is a family of personal computers introduced by Commodore International, Commodore in 1985. The original model is one of a number of mid-1980s computers with 16- or 32-bit processors, 256 KB or more of RAM, mouse-based GUIs, and sign ...

computer. This mode uses six bitplanes (six bits/pixel). The first five bitplanes index 32 colors selected from a 12-bit

color space A color space is a specific organization of colors. In combination with color profiling supported by various physical devices, it supports reproducible representations of colorwhether such representation entails an analog or a digital represen ...

(4096 possible colors). If the bit on the sixth bitplane is set, the display hardware halves the brightness of the corresponding color component. This way 64 simultaneous colors are possible (32 arbitrary colors plus 32 half-bright components) while only using 32 color registers. The number of color registers is a hardware limitation of pre- AGA chipsets used in Amiga computers. Some contemporary game titles and animations used EHB mode as a hardware-assisted means to display shadows or silhouettes. EHB was also often used as general-purpose 64 color mode with the aforementioned restrictions. Some early versions of the first Amiga, the Amiga 1000 sold in the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...

lack the EHB video mode, which is present in all later Amiga models.

References

External links

Animated demo using Halfbrite mode
(requires

Java Java (; id, Jawa, ; jv, ꦗꦮ; su, ) is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea to the north. With a population of 151.6 million people, Java is the world's mo ...

)
Amiga Graphics Archive - Extra Half-Brite
{{Amiga hardware Computer display standards Amiga Color depths

See also

References

External links