Computer Science

    Subdecks (2)

    Cards (42)

    • How are Character stored
      • Each character is given a unique binary code.
    • Unicode
      Unicode uses more (usually 16 or 32) bits per character.
    • How are Images stored
      Images are split into pixels . Each pixel can only have one
      colour
    • How many bits are used per pixel ?
      Each colour has to be given a unique binary colour code
    • ASCII
      Each colour has to be given a unique binary colour code
    • Resolution
      The height and width of the image in pixels
    • Colour depth
      how many colours are available
    • Effects of Changing resolution
      • higher resolution = more pixels, better quality image but larger file size. 
    • Effects of changing Colour depth
      • Bigger colour depth = more colours, better quality image but larger file size. 
    • How is a sound wave stored
      The amplitude of the sound wave is sampled at regular intervals.
    • Sample Rate
      How often the samples are taken
    • Bit depth
      • how many bits are used for each sample. Usually 16.
    • Lossy compression
      reduces the file size by removing data that is not needed
    • LOSSLESS compression
      • rewrites the data in a more efficient way.
    • Benefits of Compression
      Files take up less space on disk
      Files are quicker to send