Representing Images

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  • Representing Images
    • Pixels
      • A Pixel is the smallest unit of data that can be represented in an image
      • Each one can represent a single solid block of colour.
      • The more pixels you use the better quality the image will be
    • Bitmaps
      • A bitmap image are groups of pixels
        • When you enlarge a bitmap image, you simply enlarge each pixel. If you enlarge it too far, then it will PIXELATE
      • Re - Sampling
        • It is to physically reduce the siz of s bitmap image.
          • This results in a samller file size as pixels are discarded and image therefore appaers smaller on the screen
            • If it is then magnified back it its original size it will appear PIXELATED.
    • Binary
      • The colours of each pixel is stored as binary
      • If more bits are used to represent each pixel then more combinations of binary numbers are possible. so more colours are possible in the image
      • If they is only 1 bit per pixel that would only give 2 possible colours and the  COLOUR DEPTH of 1 pixel.
    • Resolution
      • Resolution measures the amount of detail/Pixels  in an image
      • The higher the resolution the higher the image
    • MetaData
      • Metadata is data about data
        • It stores data about the track for example      -Artist name      -Album name   -Sample rate  -   Track number
      • It stores information about the image/song etc and the image itself. Also it tells the software how to display the image
        • The HEIGTH and WIDTH of the image- so each line of the image starts in the the right place
        • The RESOLUTION DEPTH - so the image displays at the correct size.
        • The COLOUR DEPTH - so the correct number of bits is used to represent data
    • Representing Data
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