GCSE Computer Science (AQA)

Topic Summaries

COMPUTER SYSTEMS: Encoding and compression

Images

  • Bitmap images are made of pixels, and each pixel has a binary colour code or colour value.
  • Important terms:
    • Colour depth: bits used per pixel (more bits = more colours) 
    • Resolution: number of pixels (width × height)
    • Metadata: info stored with image (e.g. dimensions, colour depth, file format, author/creator, camera details)

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