Graphical images

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  • Represeting Images
    • pixel
      • picture cell - a dot that makes up a part of n image
    • bit maps
      • images stored as a series of bits
      • each bit = a part of the image
      • JPEG, GIF, PNG
    • resolution
      • number of pixels per unit length
      • affects clarity of image
      • larger resolution = larger memory
    • vector images
      • Uses shapes to define parts of the image
      • efficient
        • not every pixel needs to be saved
      • SVG = scalable vector graphics
      • autoshapes - micosoft offices
      • animated movies, PDF's
    • Image display
      • rasterised - vector image is converted into pixels
    • colour depth
      • measured in bits
      • number of bits = how many colours available  for each pixel
    • Metadata - data about data
      • filename
      • file format
      • resolution
      • colour depth
    • Compression
      • reduce file sizes
      • PNG - lossless - high quality
      • JPEG
        • lossy
      • GIF - unsuitable lity photographs

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