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The DVD-Video and Blu-ray Disc standards support a bit depth of 8 bits per color in YCbCr with 4:2:0 chroma subsampling. [16] [17] YCbCr can be losslessly converted to RGB. MacOS refers to 24-bit color as "millions of colors". The term true color is sometimes used to mean what this article is calling direct color. [18]
8-bit color graphics are a method of storing image information in a computer's memory or in an image file, so that each pixel is represented by 8 bits (1 byte). The maximum number of colors that can be displayed at any one time is 256 per pixel or 2 8 .
Systems with a 6-bit RGB palette use 2 bits for each of the red, green, and blue color components. This results in a (2 2) 3 = 4 3 = 64-color palette as follows: 6-bit RGB systems include the following: Enhanced Graphics Adapter (EGA) for IBM PC/AT (16 colors at once) Sega Master System video game console (32 colors at once)
The 4-bit per pixel (4bpp) format supports 16 distinct colors and stores 2 pixels per 1 byte, the left-most pixel being in the more significant nibble. [5] Each pixel value is a 4-bit index into a table of up to 16 colors. The 8-bit per pixel (8bpp) format supports 256 distinct colors and stores 1 pixel per 1 byte.
The number of distinct colors that can be represented by a pixel depends on the number of bits per pixel (bpp). A 1 bpp image uses 1 bit for each pixel, so each pixel can be either on or off. Each additional bit doubles the number of colors available, so a 2 bpp image can have 4 colors, and a 3 bpp image can have 8 colors:
Bit 4: 96 Bit 3: 88 Bit 2: 48 Bit 1: 44.1 Bit 0: 32 3 Bitrate / format dependent: For codec 1, LPCM: Bits 7–3: Reserved Bit 2: 24-bit depth Bit 1: 20-bit depth Bit 0: 16-bit depth For audio format codecs 2–8, the maximum supported bitrate in bit/s, divided by 8000. For audio format codecs 9–14, format dependent value. For audio format ...
In some contexts, the term bitmap implies one bit per pixel, whereas pixmap is used for images with multiple bits per pixel. [3] [4] A bitmap is a type of memory organization or image file format used to store digital images. The term bitmap comes from the computer programming terminology, meaning just a map of bits, a spatially mapped array of ...
In 15-bit high color, one of the bits of the two bytes is ignored or set aside for an alpha channel, and the remaining 15 bits are split between the red, green, and blue components of the final color. Each of the RGB components has 5 bits associated, giving 2⁵ = 32 intensities of each component. This allows 32768 possible colors for each pixel.