Calculating Bitmap Image Size (AQA GCSE Computer Science): Flashcards

File size

Width, height, colour depth

Bits used to store each pixel's colour info

$W \times H \times D$

8 bits

$\frac{W \times H \times D}{8}$

2 colours

256 colours

Over 16 million colours

$2^n$ where $n$ is number of bits

Tiny coloured squares that make up an image

Forgetting to divide by 8 (bits to bytes)