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Extra Half-Brite, usually abbreviated as EHB, is a
Animated demo using Halfbrite mode
(requires
Amiga Graphics Archive - Extra Half-Brite
{{Amiga hardware Computer display standards Amiga Color depths
Extra Half-Brite, usually abbreviated as EHB, is a planar
Planar is an adjective meaning "relating to a plane (geometry)".
Planar may also refer to:
Science and technology
* Planar (computer graphics), computer graphics pixel information from several bitplanes
* Planar (transmission line technologies), ...
display mode of the Amiga computer.
This mode uses six bitplanes (six bits/pixel). The first five bitplanes index 32 colors selected from a 12-bit
Possibly the best-known 12-bit CPU is the PDP-8 and its relatives, such as the Intersil 6100 microprocessor produced in various forms from August 1963 to mid-1990. Many analog to digital converters (ADCs) have a 12-bit resolution. Some PIC mic ...
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
Aga or AGA may refer to:
Business
* Architectural Glass and Aluminum (AGA), a glazing contractor, established in 1970
* AGA (automobile), ''Autogen Gasaccumulator AG'', 1920s German car company
*AGA AB, ''Aktiebolaget Svenska Gasaccumulator'', a ...
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
The Commodore Amiga 1000, also known as the A1000, is the first personal computer released by Commodore International in the Amiga line. It combines the 16/32-bit Motorola 68000 CPU which was powerful by 1985 standards with one of the most adv ...
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 primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...
lack the EHB video mode, which is present in all later Amiga models.
See also
*Original Chip Set
The Original Chip Set (OCS) is a chipset used in the earliest Commodore Amiga computers and defined the Amiga's graphics and sound capabilities. It was succeeded by the slightly improved Enhanced Chip Set (ECS) and greatly improved Advanced G ...
* Hold-And-Modify
Hold-And-Modify, usually abbreviated as HAM, is a display mode of the Commodore Amiga computer. It uses a highly unusual technique to express the color of pixels, allowing many more colors to appear on screen than would otherwise be possible ...
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 mos ...
)Amiga Graphics Archive - Extra Half-Brite
{{Amiga hardware Computer display standards Amiga Color depths