O-LevelComputer ScienceData Representation2210/13 · Oct/Nov 2023 · Q76 Marks

A photographer takes an image with a digital camera. The photographer sets the resolution and colour depth for the image.

(a)State what is meant by the image resolution.[1]
(b)State what is meant by the image colour depth.[1]
(c)Give one benefit of increasing the colour depth of the image.[1]
(d)The photographer compresses the image using a method that permanently reduces the colour depth and resolution of the image. Identify which compression method the photographer uses.[1]
(e)One benefit for compressing the image is to reduce the storage space it uses. Give two other benefits of compressing the image. 1 2[2]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2023). The mark or mark type is shown in brackets.

[1] (a) The dimensions of an image // Number of pixels wide by number of pixels high
[1] (b) The number of bits used to represent each/a colour
[1] (c) Any one from: A greater range of colours can be seen/used, Image will be closer to the actual content of the image/real life, The image will have more detail
[1] (d) Lossy
[2] (e) Any two from: Quicker to transmit/upload/download, Not as much bandwidth needed to transmit file, To fit in limitation of file size on e.g. email

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