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The Atari ST series has a digital-to-analog converter of 3-bits, eight levels per RGB channel, featuring a 9-bit RGB palette (512 colors).Depending on the (proprietary) monitor type attached, it displays one of the 320×200, 16-colors and 640×200, 4-colors modes with the color monitor, or the high resolution 640×400 black and white mode with the monochrome monitor.
This allows for 256 colors in indexed display modes and 262,144 colors (18-bit) in Hold-And-Modify (HAM-8) modes. The palette for the AGA chipset has 256 entries from 16,777,216 colors (24-bit), whereas previous chipsets, the Original Chip Set (OCS) and Enhanced Chip Set (ECS), only allow 32 colors out of 4096 or 64 colors in Amiga Extra Half ...
Fragment of full-color image (left) vs Amiga HAM (right) Hold-And-Modify, [1] [2] [3] usually abbreviated as HAM, [4] is a display mode of the Amiga computer. [5] 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.
It may be significant that (in contrast to Deluxe Paint) by the time of Brilliance's launch, the Amiga market was already in serious decline. [citation needed] TrueBrilliance was notable for its ability to edit true 15 and 24-bit color images, even on older Amigas which could only display HAM-6 (pseudo-12-bit color) graphics. [3]
Later revisions, dubbed 'Fat Agnus', added 512 KB pseudo-fast RAM, which for ECS was changed to 1 MB (sometimes called 'Fatter Agnus') and subsequently to 2 MB chip RAM. Denise is the main video processor. Without using overscan, the Amiga's graphics display is 320 or 640 pixels wide by 200 or 256 pixels tall.
Retargetable graphics [1] [2] (abbreviated as RTG) is a device driver API mainly used by third-party graphics hardware to interface with AmigaOS via a set of libraries. [3] The software libraries may include software tools to adjust resolution, screen colors, pointers, and screenmodes. It will use available hardware and will not extend the ...
The number of color registers is a hardware limitation of pre-AGA chipsets in Amiga computers. Some contemporary games ( Fusion , [ 9 ] Defender of the Crown , [ 10 ] Agony , [ 11 ] Lotus II , [ 12 ] or Unreal [ 13 ] ) and animations ( HalfBrite Hill [ 4 ] ) use EHB mode as a hardware-assisted means to display shadows or silhouettes.
CyberGraphX (pronounced "cybergraphics"), is the standard ReTargetable Graphics API available for the Amiga and compatible systems. It was developed by Thomas Sontowski and Frank Mariak and later adopted by Phase5 for use with their graphics cards. Many other graphics card manufacturers who offered hardware for Amiga and compatible systems used ...