Image Compression

What Does Image Compression Mean?

Image compression is the process of encoding or converting an image file in such a way that it consumes less space than the original file.

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It is a type of compression technique that reduces the size of an image file without affecting or degrading its quality to a greater extent.

Techopedia Explains Image Compression

Image compression is typically performed through an image/data compression algorithm or codec. Typically such codecs/algorithms apply different techniques to reduce the image size, such as by:

  • Specifying all similarly colored pixels by the color name, code and the number of pixels. This way one pixel can correspond to hundreds or thousands of pixels.
  • The image is created and represented using mathematical wavelets.
  • Splitting the image into several parts, each identifiable using a fractal.

Some of the common image compression techniques are:

  • Fractal
  • Wavelets
  • Chroma sub sampling
  • Transform coding
  • Run-length encoding
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Margaret Rouse
Technology Expert

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.