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:
“The noise of life begins again,
And ghastly through the drizzling rain
On the bald street breaks the blank day.”
—Alfred Tennyson (1809–1892)
“Sweet bird, that shunn’st the noise of folly,
Most musical, most melancholy!”
—John Milton (1608–1674)
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