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.
pig porphyria. an erythropoietic porphyria, similar to bovine congenital erythropoietic porphoryia, but inherited as a dominant trait. Discoloration of the teeth, bones and tissues occurs, but not of the urine, except in severely affected cases.Photosensitization is not a feature. The enzymatic defect is unknown.nherited as an autosomal dominant trait; affected cats have discolored teeth, urine and tissues, severe anemia and photosensitivity associated with a deficiency of uroporphyrinogen III cosynthetase. inherited porphyria. the disease is inherited in cattle and swine and is similar to erythropoietic porphyria of humans.