Dither and Quantization Error

Dither and Quantization Error

Dither is an internationally applied form of noise used to randomized quantization error, preventing large-scale patterns such as "banding" in images.

Dither and Quantization Error

Example of image "Banding"

Dither is routinely used to processing both digital audio and digital video data and usually one of the last stages in post production for compact discs. 

Quantization Error is the difference in the actual analog value and the quantized digital value. This is due to either rounding of digital views or truncation. The error is sometimes considered as an additional random signal called quantization noise because of its "stochastic" or non-deterministic behaviour