Dither is an intentionally applied form of noise used to randomize quantization error, preventing large-scale patterns such as color banding in images. Dither is routinely used in processing of both digital audio and digital video data, and is often one of the last stages of audio production to compact disc.
Hepatic porphyria. Hepatic porphyrias is a form of porphyria in which the enzyme deficiency occurs in the liver. Examples include (in order of synthesis pathway): Acute intermittent porphyria. Porphyria cutanea tarda and Hepatoerythropoietic porphyria.
Porphyria is a rare hemoglobin disorder which is said to be caused due to hereditary factors. It is considered a hereditary disease which states abnormal metabolism of the blood pigment hemoglobin. Porphyrias mainly affect skin or the nervous system that can cause pain in the abdomen.