Extra Half-Brite
E736622
Extra Half-Brite is a special Amiga display mode that allows 64-color graphics by using an additional bitplane to show dimmed versions of 32 base colors.
Statements (41)
| Predicate | Object |
|---|---|
| instanceOf |
Amiga display mode
ⓘ
computer graphics display mode ⓘ |
| advantage |
allows shading and lighting effects via half-bright colors
ⓘ
doubles apparent color count with minimal memory increase ⓘ |
| alsoKnownAs |
EHB
NERFINISHED
ⓘ
Extra-Halfbrite mode NERFINISHED ⓘ |
| baseColorCount | 32 ⓘ |
| bitplaneCount | 6 ⓘ |
| category |
Amiga graphics technology
ⓘ
bitplane graphics mode ⓘ |
| colorDepth | 6-bit RGB equivalent ⓘ |
| colorModel | indexed color ⓘ |
| colorSelection | 32 freely selectable base palette entries ⓘ |
| derivedColorMechanism | hardware halves RGB values when extra bitplane is set ⓘ |
| documentation | described in Amiga Hardware Reference Manual ⓘ |
| era | late 1980s home computer graphics ⓘ |
| extraBitplanesUsedFor | half-brightness flag ⓘ |
| halfBrightColorCount | 32 ⓘ |
| halfBrightColorsDerivedFrom | 32 base colors ⓘ |
| halfBrightComputation | performed in hardware, not in software ⓘ |
| halfBrightIntensity | approximately 50% of base color intensity ⓘ |
| hardwareSupport |
ECS
NERFINISHED
ⓘ
OCS NERFINISHED ⓘ |
| implementedBy | Amiga Agnus and Denise custom chips ⓘ |
| introducedWith | original Amiga 1000 era chipsets ⓘ |
| memoryCostComparedTo32Color | requires one additional bitplane ⓘ |
| paletteLimit | 32 independent color registers ⓘ |
| paletteSource | Amiga custom chipset color registers ⓘ |
| platform | Commodore Amiga NERFINISHED ⓘ |
| relatedMode |
HAM (Hold-And-Modify)
NERFINISHED
ⓘ
standard 32-color Amiga mode ⓘ |
| renderingCharacteristic | half-bright colors always tied to corresponding base palette entries ⓘ |
| requires | 6th bitplane set as extra-halfbrite plane ⓘ |
| supports | up to 64 simultaneous on-screen colors without HAM ⓘ |
| totalColorCount | 64 ⓘ |
| typicalUse |
demos
ⓘ
games ⓘ graphics applications ⓘ |
| usedIn |
Amiga demo scene productions
ⓘ
Amiga games with detailed backgrounds ⓘ |
| usesBitplanes | yes ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Original Amiga chipset