Colour depth is describes the number of bits per pixel (bpp) that can be displayed on a computer. Each bit represents two colours, because it has a value of 0 or 1. The higher the colour depth, the more wider the range of distinct colours (more bpp = more colours displayed).
The following are examples of colour depth:
• 1-bit allows 2 colours
• 4-bit allows 4 colours
• 8-bit allows 256 colours
• 16-bit allows 65 536 colours
• 24-bit allows 16 777 216 colours
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