color depth

(redirected from 48-bit colour)

color depth

The number of bits used to hold a screen pixel. Also called "pixel depth" and "bit depth," the color depth is the maximum number of colors that can be displayed. True Color (24-bit color) is required for photorealistic images and video, and modern graphics cards support this bit depth.

Per Pixel or Per Subpixel
The color depth of a screen can be referenced by the number of bits in each subpixel or by the total number of bits per pixel. For example, 8-bit color and 24-bit color can mean the same system. The 8-bits refers to each red, green and blue subpixel, while the 24-bit means all three subpixels. Likewise, 10-bit color (subpixels) and 30-bit color (pixels) are the same. See indexed color and bit depth.

Bits Per Pixel    Total Colors

    4    16  (Standard VGA)
    8    256 (Super VGA, indexed color)
   15    32K (option on earlier cards)
   16    65K (High Color)
   24    16M (True Color)
   32    16M (True Color + alpha channel)
   30     1B (Deep Color)
   36    68B (Deep Color)
   48   260T (Deep Color)


References in periodicals archive ?
Quality has been enhanced to include a 9,600 x 9,600 dpi CCD sensor, while the 48-bit colour depth ensures accurate colour rendition and images suitable for enlargement and high-resolution printing, it added.
Increased speed does not impinge on quality and the 48-bit colour capability recognises more than 281 trillion colours.
Perfection 3200 PHOTO can scan medium and large format film and features 48-bit colour recognition, while three settings are selectable that give the scanner fully automated or manual scanning options.
The flatbed scanner is conveniently situated on top of the unit and gives 600x1200dpi scanning in 48-bit colour to provide rich and accurate scans of documents, drawings and photos.
Increased speed does not cut down on quality and the Visioneer's 48-bit colour capability recognises 281trillion colours.