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The random variation of brightness or color information in images is called image noise. Usually, it does not present in the object image. It can be produced by the sensor of a scanner or digital camera.

Learn more about Image Noise:

Image Noise by Wikipedia

Reducing Noise In Images With Photoshop by Photoshop Essentials

3 ways to reduce image noise in Photoshop by Graphics

See also:

Image Resample

Image Size Units

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