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.
Read more about this topic: Image Noise
Famous quotes containing the word noise:
“Speak, ye that ride on white asses, ye that sit in judgment, and walk by the way.
They that are delivered from the noise of archers in the places of
drawing water, there shall they rehearse the righteous acts of the
Lord,”
—Bible: Hebrew Judges (l. V, 10–11)
“There must be no cessation
Of motion, or of the noise of motion,
The renewal of noise
And manifold continuation....”
—Wallace Stevens (1879–1955)