Sometimes inaccurately called posterization, banding is when an image shows different bands of color or luminance instead of a smooth gradation. An example of this may be found in an image of blue sky -- instead of seeing a smooth blue, there will be bands visible across the sky as the color changes.
Canon glossary us
An artefact of colour gradation in computer imaging. When graduated colours break into larger blocks of a single colour, the smooth look of a proper gradation is reduced.
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Smooth graduated colors reduced to larger blocks of color. This produces a visible stepping of shades in the image.
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An artifact of color gradation where graduated colors are reduced to larger blocks of a single color. .
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