Differences in color visual effects between spot color printing blocks and four color stacking blocks

The inks prepared by spot color printing are obtained according to the principle of mixing by subtractive colorants of pigments, which have lower color brightness and higher saturation; uniform color blocks of ink are usually printed in the field and the ink volume is appropriately increased. When the layout of the ink layer is large, the sensitivity of the ink layer thickness changes to the color change will be reduced, so it is easier to get uniform, thick printing effect of the ink.

The use of four-color printing process overprint color blocks, due to the composition of the color of the various colors are mostly composed of a certain percentage of dots, when printing dots, the ink layer thickness must be strictly controlled, easy to change due to the ink layer thickness and printing Changes in process conditions cause changes in color intensity, changes in dot gain, and color changes. Moreover, since any color change that composes the color block will cause the change of the color of the color block, the chance of uneven ink color will multiply, so the color blocks overprinted by the four-color printing process are not easy to obtain ink color. Uniform effect.

If the color of the color block can not be overprinted with a multi-color machine at one time, color shift may occur easily because the color of the semi-finished product is not easy to control. In addition, the combined effect of subtractive color absorption and additive blending of dots obtained by four-color printing is high in color brightness and low in saturation. For light-colored blocks, a four-color printing process is used. Due to the low coverage of the ink by the ink, the lack of solid ink is bland. In the ink, the coverage of the paper is low, and the bland ink lacks a solid feeling. Due to the chromaticity of the dots, it is inevitable that people will feel the presence of patterns.