dither

Short definition from Wiktionary

Verb

1. 1
   To tremble, shake, or shiver.
2. 2
   To be uncertain or unable to make a decision; to vacillate, hesitate, or delay.
3. 3
   To do something nervously.
4. 4
   To apply an algorithm to digital data to minimize the effects of quantization: To use dot patterns in an image or graphic to simulate colors or shades not in the system palette.
5. 5
   To apply an algorithm to digital data to minimize the effects of quantization: To intentionally add noise to a signal to remove artifacts caused by digitization.

Noun

1. 1
   Trembling, shaking, or shivering.
2. 2
   A state of nervous excitement.
3. 3
   The state of being undecided; indecision; vacillation.
4. 4
   Any algorithm applied to digital data to minimize the effects of quantization: A form of noise intentionally added to remove artifacts caused by digitization.
5. 5
   Any algorithm applied to digital data to minimize the effects of quantization: The use of dot patterns in an image or graphic to approximate colors not available in the system palette.