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.
What Is Porphyria? Porphyrias are a group of rare inherited blood disorders. People with these disorders do not make heme, a component of hemoglobin (protein in red blood cells that carries oxygen) properly. Heme is made of porphyrin (a naturally-occurring organic compound in the body) bound to iron.