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AQA · GCSE · Computer Science · Higher

Minimum bitmap colour depth

Q05.2 1 mark

Figure 2 shows four bitmap images.

Figure 2
Figure 2

Figure 2

Enlarged question image

Figure 2

State the minimum colour depth required to represent Image B in Figure 2.

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Marking points

  1. 1 States a colour depth of 1 bit.

Full-mark answer

1 bit

Why this answer loses marks

I used the number of colours as the colour depth.

Colour depth is the minimum number of bits needed to encode the visible colours, not the colour count itself.

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