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Pigments can also be called levels, it is said to display screen brightness intensity index, which is what we said the color index. Display screen color richness and fineness is determined by the color scale. Industry-standard 256-color, 4096 colors, 65536 colors. Also color depth is 16 times as a base growth.

Pigment to make foods more attractive

Many natural foods has its own color, the color can enhance one's appetite, increases the secretion of digestive juices, so conducive to digestion and absorption, and is an important sensory food. However, natural food processing preservation process easily fade or change color, in order to improve the color of food, people used to processed food in the process of adding food coloring, to improve their sensory properties. Add pigments in food is not a modern patent, in fact, in ancient times, people knew the use of monascus pigments to produce wine. Since 1856 the English Parkin synthesized after the first artificial colors---aniline purple, synthetic pigments also play on stage, plays the role of improved food color.

Now commonly used as a food coloring includes two types: natural pigment and synthetic pigments. Natural pigment from natural products, mainly extracted from plant tissue, as well as some pigments from animals and micro-organisms. Artificial pigment refers to the use of artificial chemical synthesis methods of organic pigments, which is separated from coal tar made from aniline dyes.

Over a long period of time, because people do not realize the dangers of synthetic pigments, contrasted with the natural pigment and pigment, with bright color, stain, the advantages of stable quality and low price, widespread use of synthetic pigments in the food processing industry in many countries.