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It must be noted that not all systems using 16-bit color depth employ the 16-bit, 32-64-32 level RGB palette. Platforms like the Sharp X68000 home computer or the Neo Geo video game console employs the 15-bit RGB palette (5 bits are used for red, green, and blue), but the last bit specifies a less significant intensity or luminance.
For the composite output, these four-bit color numbers are encoded by the CGA's onboard hardware into an NTSC-compatible signal fed to the card's RCA output jack. For cost reasons, this is not done using an RGB -to- YIQ converter as called for by the NTSC standard, but by a series of flip-flops and delay lines.
It was most common on the IBM PC (with CGA graphics), [4] TRS-80 Color Computer, [5] Apple II [6] and Atari 8-bit computers, [1] and used by the Ultima role-playing video games. [6] Software titles (such as King's Quest for the IBM PC) usually provided an option to select between "RGB mode" and "Color Composite mode". [7]
The 12-bit scRGB-nl encoding is the linear RGB channels passed through the same opto-electric conversion function as sRGB (for negative numbers use −f(−x)) and then converted by 1280x + 1024. This is exactly 5 times the color resolution of 8-bit sRGB, and 8-bit sRGB can be converted directly with 5 x + 1024 .
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.
The 3-bit RGB palette is used by: The ECMA-48 standard for text terminals (sometimes known as the "ANSI standard", although ANSI X3.64 does not define colors) Teletext Level 1/1.5 Teletext. Videotex; Oric computers; BBC Micro; The original NEC PC-8801 up to the MkII; The original NEC PC-9801 with original 8086 CPU before the VM/VX models
24-bit palette sample image 24 bit Palette Color Test Chart. This is a full list of color palettes for notable video game console hardware.. For each unique palette, an image color test chart and sample image (original True color version follows) rendered with that palette (without dithering unless otherwise noted) are given.
In computer graphics, pixels encoding the RGBA color space information must be stored in computer memory (or in files on disk). In most cases four equal-sized pieces of adjacent memory are used, one for each channel, and a 0 in a channel indicates black color or transparent alpha, while all-1 bits indicates white or fully opaque alpha.