Nancy has captured images of her holiday with her camera. The captured images are stored as digital photo files on her camera. Explain how the captured images are converted to digital photo files.

Mark scheme

Marking points from the official mark scheme (May/June 2018). The mark or mark type is shown in brackets.

1. [1] (a) Image is converted from analogue to digital (using ADC)
2. [1] (a) Image is turned into pixels
3. [1] (a) Each pixel is given a binary value
4. [1] (a) Pixels form a grid (to create the image)
5. [1] (a) Each pixel has a colour
6. [1] (a) Pixels are stored in sequence (in a file)
7. [1] (a) Meta data is stored (to describe the dimensions/resolution of the image) // It stores the dimensions/colour depth .etc.
8. [1] (a) An example of a suitable photo file format e.g. JPEG
9. [1] (b) Lossy
10. [1] (b) Lossy would reduce the file size more (than lossless)
11. [1] (b) The redundant data can be removed from the files // by example (must be about redundant data)
12. [1] (b) Images can still be a similar quality
13. [1] (b) There is no requirement for the files to be exactly the same as original file
14. [1] (b) Photos can be sent quicker // faster to upload // faster to download