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This is also the number of colors used in true color image files, like Truevision TGA, TIFF, JPEG (the last internally encoded as YCbCr) and Windows Bitmap, captured with scanners and digital cameras, as well as those created with 3D computer graphics software. 24-bit RGB systems include: Amiga Advanced Graphics Architecture (256 or 262,144 colors)
Original – All 16,777,216 colors of a 24-bit RGB palette. Reason This image displays all 16,777,216 colors of a 24-bit RGB palette, which is commonly used in computer graphics and known as "truecolor". Articles in which this image appears Color depth, Color vision, Color FP category for this image Photographic techniques, terms, and equipment ...
An early example was the Radius ThunderPower card for the Macintosh, which included extensions for QuickDraw and Adobe Photoshop plugins to support editing 30-bit images. [20] Some vendors call their 24-bit color depth with FRC panels 30-bit panels; however, true deep color displays have 10-bit or more color depth without FRC.
When 24-bit color became the norm, palettes could instead be populated with the optimum colors for individual images. A small color table may suffice for small images, and keeping the color table small allows the file to be downloaded faster. Both the 87a and 89a specifications allow color tables of 2 n colors for any n from 1 through 8.
Indexed color images may be compressed with 4-bit or 8-bit RLE or Huffman 1D algorithm. OS/2 BITMAPCOREHEADER 2 24bpp images may be compressed with the 24-bit RLE algorithm. The 16bpp and 32bpp images are always stored uncompressed. Note that images in all color depths can be stored without compression if so desired.
Here is an example of color channel splitting of a full RGB color image. The column at left shows the isolated color channels in natural colors, while at right there are their grayscale equivalences: Composition of RGB from three grayscale images. The reverse is also possible: to build a full-color image from their separate grayscale channels.
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High-end digital image equipment are often able to deal with larger integer ranges for each primary color, such as 0..1023 (10 bits), 0..65535 (16 bits) or even larger, by extending the 24 bits (three 8-bit values) to 32-bit, 48-bit, or 64-bit units (more or less independent from the particular computer's word size).