Image Noise - Useful Noise

Useful Noise

High levels of noise are almost always undesirable, but there are cases when a certain amount of noise is useful, for example to prevent discretization artifacts (color banding or posterization). Some noise also increases acutance (apparent sharpness). Noise purposely added for such purposes is called dither; it improves the image perceptually, though it degrades the signal-to-noise ratio.

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Famous quotes containing the word noise:

    “Sing unto the Lordwith the harp, with the harp, and the voice of a
    psalm.
    With trumpets and sound of cornet make a joyful noise before the Lord,”
    —Bible: Hebrew Psalm XCVIII (l. XCVIII, 5–6)

    “Sweet bird, that shunn’st the noise of folly,
    Most musical, most melancholy!”
    —John Milton (1608–1674)