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12/03 ~ Image Data Type

posted Mar 11, 2010, 3:37 PM by Unknown user   [ updated Mar 13, 2010, 10:16 PM ]
There are two main methods for storing image data (eg phtotgraphs,grapphics in a website, screenshots)
  1. Bitmap - in a bitmap each inidividual dot is storerd seperately. These inidividual dots are called picture elements or pixels for short. The file size of a bitmap depends on two things
    • the number of pixels
    • the number of colours

      When the number of colours is reduced on a bitmap, an effect is observed called banding.
  2. Vector - rather than storing pixels (individual dots), a vector image mathematically represents the shapes and colours in an image. Vector images are almost always vastly smaller than bitmap