Analysis of the principles that should be followed in the selection of color order
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1. Arrange the color order according to the brightness of the three primary colors
The brightness of the three primary color inks is reflected on the spectrophotometric curve of the three primary color inks, and the higher the reflectance, the higher the brightness of the ink. Therefore, the brightness of the three primary colors ink is yellow > green > magenta > black. The first print with a small brightness and the back print with a large brightness.
2. Arranging the color sequence according to the transparency and hiding power of the three primary color inks
The transparency and hiding power of the ink depends on the difference in refractive index between the pigment and the binder. The ink with strong opacity has a great influence on the color after the color combination, and it is not easy to display the correct color as the post-printing overprint, and the good color mixing effect is not achieved. Therefore, the ink with poor transparency is printed first, and the ink with strong transparency is printed.
3. Arrange the color sequence according to the size of the dot area
In general, the area of the dot is small and the print is large.
4, according to the characteristics of the original arrangement of color order
Each original has different characteristics, some are warm and some are cool. In the order of color sequence, the color sequence mainly composed of warm color is black, cyan, magenta, and yellow; the color sequence mainly composed of cool color is black, magenta, cyan, and yellow.
5, according to the different arrangement of color order
(1) Monochrome color sequence: When a monochrome machine prints a multi-color product, the ink transfer is wet and dry, and when the color sequence is considered, the ink viscosity can be placed in a lesser position.
Under the condition that the quality of paper and ink is good, the general printing color sequence is black, cyan, magenta and yellow. When the paper quality is poor, the surface is rough, the tightness is low, and the ink absorption is strong, the color order can be selected to be yellow, magenta, cyan, and black. Due to the large size of the yellow plate, it can make up for the defects of the paper. Make the printing effect better. In addition, yellow, magenta, cyan, and black sequences are used to facilitate color change, and it is easy to clean the ink roller and ink tank. Another reason why the monochrome offset printing machine first prints the yellow version is that the human vision is not sensitive to the yellow dot, and when the yellow color is printed, even if there is a slight overprinting phenomenon, the naked eye is not easy to observe, thus Conducive to the effect of four-color overprinting.
(2) In the printing of the two-color machine, the second color and the third color are wet-stacked overprinting. The printing of 1-2 colors and 3 4 colors is wet-stack overprinting. The printing color sequence of the two-color machine is alternated between bright and dark colors, and the ink quantity is placed in the second color group. Therefore, the following is generally used in printing. Printing color sequence: 1-2 color magenta - blue or cyan - magenta; 3-4 color black - yellow or yellow - black, but also as needed. To highlight a certain color, such as green, you should print in the magenta-yellow, cyan-black overprint order to achieve better printing results.
It is also possible to use a color sequence of black-yellow, magenta-cyan, which is easier to control.
(3) Four-color machine printing is a wet-wet printing method. In order to make the latter color ink transfer better to the ink layer of the previous color substrate, the adhesion of the ink along the printing color sequence should be sequentially reduced, otherwise a reverse stack will occur. Printing phenomenon. Generally, the ink is printed with a dark color with a large viscosity, and the ink with a small viscosity is printed with a small color. Common color sequences are black, cyan, magenta, yellow, or black, magenta, cyan, and yellow. While changing the color sequence, the viscosity of the ink should also be adjusted accordingly.
In the four-color machine printing, the yellow ink is discharged to the last color printing, which has three main advantages:
(1) Since the yellow ink has good transparency, the last color is used to facilitate sufficient light amount to enter the upper and lower ink layers, so that the printed matter is more vivid.
(2) The drying performance of yellow ink is faster and the printing area is larger. Arranging the yellow ink to the last color not only prevents the crystallization caused by the excessive drying speed of the yellow ink, but also utilizes the characteristics that the printing area is large and the conjunctiva is quickly oxidized, and the cover is covered on the surface of other ink layers. Improve the gloss of printed matter.
(3) The yellow color is arranged in the last color, which is convenient for controlling the amount of ink used in yellow, and can be adjusted at any time according to the sample.
6. Arrange the color sequence according to the nature of the paper
The smoothness, whiteness, tightness and surface strength of the paper are different. Flat and tight papers are first printed in dark colors and then printed in bright colors. Thick and loose papers are printed with bright yellow ink and then printed with dark colors. Covers paper defects such as paper and powder.
7. Arranging the color sequence according to the drying performance of the ink
Practice has proved that yellow ink is nearly twice as fast as magenta ink, magenta ink is twice as fast as green ink, and black ink is the slowest. Ink with slow drying performance should be printed first, and ink with fast drying performance should be printed. The monochromator machine crystallizes the anti-ink surface, and generally prints yellow at the end to facilitate rapid conjunctival drying.
8, according to the flat network and the field arrangement color order
When the printed matter has the flat net and the ground, in order to obtain good printing quality, the printed place is flat, the ink color is thick, and the color is bright. Generally, the flat net graphic is printed first, and then printed on the ground.
9, according to light and dark color arrangement
In order to make the printed matter have a certain gloss and print a light color, first print dark, then print light color.
10. Products based on text and black version generally adopt cyan, magenta, yellow, and black sequences, but black text and patterns cannot be printed on yellow solids. Otherwise, due to the small viscosity of yellow ink and large black viscosity, reverse overprinting occurs. Causes black not to print or print.
11. For a picture with a small color overprinting area, the color registration sequence can generally adopt the principle of large color printing after printing.
12, gold, silver products, because the adhesion of gold ink, silver ink is very small, gold, silver ink should be placed in the last color as much as possible, under normal circumstances should not use three stacks of ink printing.
13, the color sequence of printing should be as consistent as possible with the color sequence when proofing, otherwise it will not catch up with the proofing effect.
14. When printing, the angles of the adjacent two-color sequence cables should be 30° apart. If black, cyan, magenta, and yellow are used, the corresponding screen angles are black 75°, green 15°, magenta 45°, and yellow 90°. In summary, in the actual printing production, according to the quality requirements of the printed matter, the performance of the paper, the ink, the precision of the printing machine, etc., the printing color sequence can be flexibly arranged to achieve the best printing effect.