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This page is part of the old A451 specification - current syllabus here

1. Introduction

Specification point:

i) Explain the representation of an image as a series of pixels represented in binary

ii) Explain the need for metadata to be included in the file such as height, width and colour depth

iii) Discuss the effect of colour depth and resolution on the size of an image file and the need for compression e.g. JPEG and GIF