Fourteen principles that cannot be ignored when determining the color sequence

Printing color sequence will directly affect the quality of printed products. In order to obtain a good copying effect, the following principles must be followed:

1. Color sequence according to the brightness of the three primary colors: The brightness of the three primary colors is reflected on the spectrophotometric curve of the three primary colors. The higher the reflectance, the higher the brightness of the ink. Therefore, the brightness of three primary colors of ink is: yellow> cyan> magenta> black.

2. According to the transparency and hiding power of the three primary color inks, the color sequence is arranged: The transparency and hiding power of the ink depend on the difference between the refractive index of the pigment and the binder. The ink with high hiding power has a greater influence on the color after the color stacking. As the overprinting of the printing ink, the correct color cannot be displayed and the good color mixing effect cannot be achieved. Therefore, the ink with poor transparency is printed first, and the transparency is strong.

3. According to the size of the dot area arranged color sequence: In general, the small area of ​​the first printing area, a large area of ​​the post-printing.

4. According to the characteristics of the original arrangement color sequence: Each original has different characteristics, some warm, some cool. In the arrangement of color order, the first printing with warm tone is black and blue, and the latter is printed with red and yellow; the cold tone is the first printing of red and the latter is blue.

5. According to the different arrangement of the device color sequence: Under normal circumstances, monochrome or two-color machine printing color sequence alternating with light and dark is appropriate; four-color printing press generally print dark color, after printing bright color.

6. According to the nature of the paper arranged color sequence: paper smoothness, whiteness, tightness and surface strength are different, flat and tight paper first printed dark, bright after printing; coarse, loose paper, first printed bright yellow ink, Dark color after printing, because the yellow ink can cover off paper defects such as paper and powder.

7. According to the drying performance of the ink arrangement color sequence: Practice has proved that the yellow ink is nearly twice as fast as the magenta ink, the magenta ink is twice as fast as the blue ink, and the black ink is the slowest. Slow-drying inks should be printed first, followed by fast-drying inks. The monochrome machine is glass-repellent, and it is generally printed with yellow so that the conjunctiva can be dried quickly.

8. According to flat screen and field arrangement color sequence: When the replica has flat screen and field, in order to obtain good printing quality, make the plain clothes, bright and thick ink, generally flat printing network graphic, after printing the real structure.

9. According to the light and dark color array: To make the print with a certain degree of gloss and add light color, first print dark color, after printing light color.

10. The area of ​​the landscape version of the landscape product is much larger than that of the magenta version. According to the principle of the large-format color printing, the black, magenta, cyan, and yellow sequences should be adopted.

11. Text-based and black-field products generally use cyan, magenta, yellow, and black sequences, but they cannot print black text and patterns on yellow solids. Otherwise, due to the low viscosity of yellow ink and the large black viscosity, reverse printing occurs. Black or black prints are not true.

12. For a screen with a small four-color overprint area, the color registration sequence can generally use the principle of a large-format color printing after printing.

13. Gold and silver products. Since the adhesion of gold ink and silver ink is very small, the gold and silver inks should be placed on the last color as much as possible. Under normal circumstances, it is not appropriate to use three overlapping ink printings.

14. The color sequence of the printing should be consistent with the color sequence at the time of proofing, otherwise it will not be able to catch up with the effect of proofing.