Colour Depth
24-bit colour depth is used by virtually every computer and phone display and the vast majority of image storage formats.
With 24-bit colour, also called "True Colour" and "RGB colour,"
over 16 million colours can be represented in the colour palette.

24 bits total per pixel means each of the three true primary colours, red, green and blue (8 bits per channel each) have 256 colour variations.

256 x 256 x 256 = 16,777,216 colours / variations of each colour.
The human eye can see around 10 million colours.
As the the number of colours possible exceeds the number we can see the difference is made up with brightness variations, shade and hue, of the colours.

48-bit colour depth is referred to Deep Colour.

48 bits total per pixel means the three true primary colours, red, green and blue have 16 bits per channel, so 65,536 colour variations each, making a total of around 281 trillion colours.
We recommend 24-bit colour depth scans
World Trade Center, Twin Towers, framed in the Arch of the Washington Square Memorial
New York City, U.S.A.
Nikon F4s w AF-zoom Nikkor 80-200mm f/2.8D IFED w Exposure not recorded.
Kodak Ektachrome Elite 100 exposed at ISO125
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