Lithography is the decomposition of a series of successively tuned originals into a half-tone monochromatic version, followed by halftone monochromatic printing to achieve color reproduction. Choosing the right color sequence under the guidance of the overlapping color law can superimpose the most gorgeous colors and ensure the correct balance of printing gray. Due to the differences in ink transparency, hiding power, brightness, and other properties, what color is printed before printing, and what color is printed after printing will affect the color overlay effect. Therefore, a scientific and reasonable arrangement of color sequences can only be used to obtain high-quality reproductions that are correct, soft, rich in gradation, and correct in color to meet the needs of customers.
First, the arrangement of printing color sequence
In the multi-color printing, in the process of monochromatic printing as a unit, and sequentially overprinting and restoring originals in a certain order, the sequence of ink overprinting is called color sequential. In four-color printing, yellow, magenta, cyan, and black can be arranged in 24 different color orders.
Second, determine the principle of printing 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. The color sequence is arranged 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 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, the color sequence is arranged: In general, the dot area of ​​the dot area is small and the dot area is large.
4. According to the characteristics of the original arrangement of the color sequence: Each original has different characteristics, some warm tone, and some are cool. In the order of color arrangement, the predominantly warm tone is the first printing of black, and the later printing of red and yellow; the cold tone is the first printing of the red, and the latter is the printing of blue.
5. According to the different arrangement of the devices, the color sequence: In general, the color sequence of a single-color or two-color machine is alternated between light and dark colors. In a four-color printer, dark colors are printed first, and bright colors are printed later.
6. According to the nature of the paper, the color sequence is arranged: the smoothness, whiteness, tightness and surface strength of the paper are different. The plain and tight paper is printed with dark colors, and the bright color is printed afterwards; the rough and loose paper is first printed with 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 inks arranged color sequence: Practice has proved that yellow ink is nearly twice as fast as magenta ink, magenta ink is twice as fast as blue ink, black ink is the slowest. Slow-drying inks should be printed first, followed by fast-drying inks. The monochromator is glass-repellent, and it is generally printed with yellow to facilitate the rapid drying of the conjunctiva.
8. According to the 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 light and dark color array: To make the printed material have 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 products is much larger than that of the magenta version. According to the principles 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 black text and patterns cannot be printed on yellow solids. Otherwise, black ink has low viscosity and black viscosity is large, resulting in reverse printing, resulting in black. Can not be printed or printed.
12. For a picture with a small four-color overprint area, the color registration sequence can generally use the principle of a large-format color plate after printing.
13. Gold and silver products, because the adhesion of gold ink and silver ink is very small, gold and silver ink should be placed on the last color as much as possible. Under normal circumstances, it is not appropriate to adopt triple ink printing.
14. The color sequence of 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.
The superiority of the yellow ink in the three-color printing
1. Due to the good transparency of yellow ink, the last color is favorable for sufficient white light to enter into the upper and lower ink layers to obtain bright and vivid colors.
2. Yellow ink has a faster drying performance and has a larger printing area. The listing of yellow ink to the last color not only prevents the vitrification caused by the fast drying speed of yellow ink, but also makes use of its large printing area and the ability to quickly oxidize the conjunctiva, covering the surface of other ink layers, making Prints have a certain degree of gloss.
3. The yellow color is in the last color, which is convenient for controlling the amount of yellow ink used, and can be adjusted against the original at any time.
4. Yellow ink is expensive and it can save the amount of yellow ink and reduce costs.
In short, in the specific printing process, according to the quality requirements of the product, in accordance with the law of superposition color flexibility to choose the best printing color sequence, so that it prints the most ideal product.
First, the arrangement of printing color sequence
In the multi-color printing, in the process of monochromatic printing as a unit, and sequentially overprinting and restoring originals in a certain order, the sequence of ink overprinting is called color sequential. In four-color printing, yellow, magenta, cyan, and black can be arranged in 24 different color orders.
Second, determine the principle of printing 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. The color sequence is arranged 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 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, the color sequence is arranged: In general, the dot area of ​​the dot area is small and the dot area is large.
4. According to the characteristics of the original arrangement of the color sequence: Each original has different characteristics, some warm tone, and some are cool. In the order of color arrangement, the predominantly warm tone is the first printing of black, and the later printing of red and yellow; the cold tone is the first printing of the red, and the latter is the printing of blue.
5. According to the different arrangement of the devices, the color sequence: In general, the color sequence of a single-color or two-color machine is alternated between light and dark colors. In a four-color printer, dark colors are printed first, and bright colors are printed later.
6. According to the nature of the paper, the color sequence is arranged: the smoothness, whiteness, tightness and surface strength of the paper are different. The plain and tight paper is printed with dark colors, and the bright color is printed afterwards; the rough and loose paper is first printed with 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 inks arranged color sequence: Practice has proved that yellow ink is nearly twice as fast as magenta ink, magenta ink is twice as fast as blue ink, black ink is the slowest. Slow-drying inks should be printed first, followed by fast-drying inks. The monochromator is glass-repellent, and it is generally printed with yellow to facilitate the rapid drying of the conjunctiva.
8. According to the 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 light and dark color array: To make the printed material have 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 products is much larger than that of the magenta version. According to the principles 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 black text and patterns cannot be printed on yellow solids. Otherwise, black ink has low viscosity and black viscosity is large, resulting in reverse printing, resulting in black. Can not be printed or printed.
12. For a picture with a small four-color overprint area, the color registration sequence can generally use the principle of a large-format color plate after printing.
13. Gold and silver products, because the adhesion of gold ink and silver ink is very small, gold and silver ink should be placed on the last color as much as possible. Under normal circumstances, it is not appropriate to adopt triple ink printing.
14. The color sequence of 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.
The superiority of the yellow ink in the three-color printing
1. Due to the good transparency of yellow ink, the last color is favorable for sufficient white light to enter into the upper and lower ink layers to obtain bright and vivid colors.
2. Yellow ink has a faster drying performance and has a larger printing area. The listing of yellow ink to the last color not only prevents the vitrification caused by the fast drying speed of yellow ink, but also makes use of its large printing area and the ability to quickly oxidize the conjunctiva, covering the surface of other ink layers, making Prints have a certain degree of gloss.
3. The yellow color is in the last color, which is convenient for controlling the amount of yellow ink used, and can be adjusted against the original at any time.
4. Yellow ink is expensive and it can save the amount of yellow ink and reduce costs.
In short, in the specific printing process, according to the quality requirements of the product, in accordance with the law of superposition color flexibility to choose the best printing color sequence, so that it prints the most ideal product.
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