Computer Science 0478 · Data representation
Text, sound, images and file sizes
Original revision summary · Syllabus edition awaiting review · Cambridge alignment awaiting review
Key idea 1
ASCII uses 7 bits per character (often stored in 8); Unicode uses more bits, so it can represent many more characters.
Knowledge check · unscored
An image is 100 × 100 pixels with a colour depth of 8 bits. What is its size in bytes?
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