Image size/quality


Something I always wondered....'anyone know? :)

Y'know when you select 'image size' on a digital camera and you can select
1MP, 2MP, 5MP, 10MP and so on.
Knowing that there is only one sensor in the camera (say 10MP), how exactly
does the camera achieve this 'downsizing' to give a smaller pic, and how
does it affect the image quality?

J



.

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