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noise is generally undesirable in photography, and many photographers want to try and reduce it when taking photographs. Noise reduction tends to be about preventing noise in the first place, where as noise removal is a description of post-processing techniques for dealing with noise that is in a photograph.

Contributing Factors

Things that determine how much noise is in an image can include:

  • ISO/sensitivity
  • Sensor size
  • Exposure time

Types of Noise

There are number of different types of noise that can show up in images, including:

  • Gaussian noise
  • Salt-and-pepper noise
  • Shot noise
  • Quantization noise
  • Film grain
  • Anisotropic noise