Bit
Depth determines how many colours are available in an images colour palette,
these are represented by the numbers 0’s and 1’s, which are also called bit’s. Although
there are all of these numbers, it doesn’t mean that an image uses all of these
numbers, but instead it provides a more accurate set of colours. For a greyscale
image, the bits that are used determine how many different shades are available
of that colour. Images that use a higher bit depth can create more shades and
colours since there are more combinations of 0’s and 1’s.
The
table below shows the amount of bits per pixel, how many colours are available
for them bits and what they are commonly called:
|
Bits Per Pixel
|
Number of Colors Available
|
Common Name(s)
|
|
1
|
2
|
Monochrome
|
|
2
|
4
|
CGA
|
|
4
|
16
|
EGA
|
|
8
|
256
|
VGA
|
|
16
|
65536
|
XGA, High Color
|
|
24
|
16777216
|
SVGA, True Color
|
|
32
|
16777216 + Transparency
|
|
|
48
|
281 Trillion
|
|
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