4.1.6

Representing Images

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Bitmap

Most digital images are stored as bitmaps.

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Bitmap

  • A bitmap image is split up into tiny squares called pixels.
  • The colour of each pixel is stored as a binary number.
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Colour-depth

  • The number of bits used to store the colour of each pixel is known as the colour depth.
  • The greater the number of bits used to represent each pixel, the more unique colours can be stored.
  • Common colour depths are 1-bit, 8-bit, 16-bit, and 24-bit.
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Resolution

  • Resolution represents the number of pixels in an image.
  • The number of pixels is found by multiplying the width by the height of the image.
  • An example resolution is 1080p which is 1920x1080.
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Metadata

  • Metadata is extra information that is added to an image file such as:
    • The resolution.
    • The colour-depth.
    • The encoding format.
    • The time and date of taking the photo.

Jump to other topics

1Computational Thinking & Algorithms

2Programming

3Hardware & Software

4Data

5The Internet

6Online Safety & Security

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