Storing images

  • Created by: Tomiwaq
  • Created on: 15-05-19 18:57
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  • Storing images
    • Pixels
      • Most images are bitmap images
      • Bitmap images are made up of pixels
      • The colour for each pixel is represented by a binary code
      • Black and white images only have 2 colours
        • This means it is a 1-bit where 0 is white and 1 is black
      • 2-bit images can have up to 4 colours
      • By increasing the number of bits you can get a better range of colours
    • Colour depth and resolution
      • The higher the resolution, the more pixels in a certain area which means a better quality image
      • The resolution is the density of pixels in an image
      • Most devices use a 24-bit colour depth
      • Total number of colours 2n
      • The colour depth is the number of bits used for each pixel
      • Resolution is measured in dots per inch
      • Increasing the colour depth or resolution increases the file size
    • Metadata
      • Metadata is the information stored in an image file which helps the computer recreate the image on screen
      • Includes: file format, height, width, colour depth and resolution
      • Without metadata, devices wouldn't be able to display images
  • Colour depth and resolution
    • The higher the resolution, the more pixels in a certain area which means a better quality image
    • The resolution is the density of pixels in an image
    • Most devices use a 24-bit colour depth
    • Total number of colours 2n
    • The colour depth is the number of bits used for each pixel
    • Resolution is measured in dots per inch
    • Increasing the colour depth or resolution increases the file size

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