1. Sufficient depth of basic primary color 1) All kinds of on-the-spot color blocks, such as red, green and blue lettering and logo patterns, and basic colors that do not need layers of depth, are fully done. General customers require strong and bright colors for these lettering and logo patterns when custom printing china. Theoretically, it is to give full play to the extreme effect of the maximum field density of offset ink to achieve the maximum saturation. Although 95% of the dots will increase to 100% after printing, this is different from the effect of 100% field printing. 95% of the dots only reach the field density in 95% of the dot area, while the increased 5% area has ink, but the ink density is thin. 95% of the dot increases to 100% of the ink density, which is not as thick and bright as 100% of the field density. 2) The blue sky, ocean, green leaves, lawn and other colors in landscape photography images are in people's minds