clumping

Definition: Uneven distribution of grain, ink or other material that leads to larger groupings or clusters which appear to - or actually - merge together. * E.g. clumping in silver granules causes the graininess of an image to appear greater than the size of granules; clumping in ink-jet print-outs causes pools of ink to form, reducing resolution and muddying colours. * Also known as pooling.

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