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Amiga Halfbrite mode

From Wikipedia, the free encyclopedia

Normal 32 color mode picture
Normal 32 color mode picture
Extra Half-Brite 64 color mode picture
Extra Half-Brite 64 color mode picture

Extra Half-Brite (EHB) mode is a planar display mode of the Commodore Amiga computer. It uses six bitplanes (six bits/pixel). The first five bitplanes index 32 colors selected from a 12-bit color space (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.[1][2]

Some early versions of the first Amiga, the Amiga 1000 sold in the United States, lack the EHB video mode, which is present in all later Amiga models.

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Transcription

See also

References

  1. ^ "Extra Half Bright (EHB)". Amiga Graphics Archive. Retrieved 19 September 2011.
  2. ^ "Amiga Graphics Archive - EHB". Amiga Graphics Archive. Retrieved 19 September 2011.

External links

This page was last edited on 18 March 2021, at 06:57
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