Spot color ink blending
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When you touch the spot color and spot color printing, you will occasionally ask the technicians. When deploying the spot color inks, they are based on what theory and method, and they will mix the original color inks. They all say "by experience." The heart always thinks, how can the "disorder" of the deployment? There is always a basis.
Ink subtraction method
The ink is based on the three primary colors of the color material, yellow, magenta and cyan, which are all non-illuminants. The characteristic is to absorb (or subtract) the light of the three-color light in the white light, and to reflect the two-color light after the synthesis, as shown in the ink. Yellow, which absorbs (or subtracts) the purple-blue light in the white light, reflects the red and green light, and the two colors combine to produce yellow, magenta absorbs the green light in the white light, while the blue color absorbs the white light. Red light. Therefore, the three primary colors of the ink are called Substractive Primaries or Substractive Primary Colours.
Color characteristics
The nature of the ink color depends on: Hue, Saturation, and Luminosity. The hue is the color light reflected by the ink in the spectrum of visible light, which has a certain wavelength, which is the hue of the ink color or the appearance of a certain ink color. Saturation refers to the purity of the color. When the purity is the highest, it is based on the theory of ink subtraction, absorbing (or subtracting) the three-color light and the reflection of the two-color light. Brightness refers to the amount of light reflected from the surface of the ink, but directly produces different levels of light and dark, while the hue of the ink color is constant.
The second color is the color added by the primary ink. Such as red = yellow + magenta, green = yellow + blue, purple blue = blue + magenta. When the three primary colors are equalized, it is the gray position of the center. When the other color ink is mixed with another ink, the gray scale and brightness are reduced.
Spot color matching
After measuring the primary color ink with a densitometer, and drawing the image on the right, you can check the hue and saturation of the ink, and the relationship. That is, yellow and magenta are each 1:1; yellow and blue are 1:1, magenta and cyan are each 1:1, and red, green, and blue-violet are blended, and the ochre is black. From the figure, we can also check the complementary relationship of various colors, such as yellow and purple blue, magenta and green, cyan and red. When the color of the formulated ink is colored, if the color is greenish, a small amount of magenta and purple blue can be added. When adding a little yellow, when reddish, add blue.
Technicians can measure and paint the company's existing inks. More base inks, such as Warmred Gold, Gloss Bronze Blue, Reflex Blue, Rhodamine Red, Green, Violet, Fluorescent Yellow 803C, fluorescent red 806C, etc., as a basis, color gamut expansion is easier to master and deploy spot color ink. As for the brightness of the blend, you can add the right amount of transparent and black ink.
The author is engaged in the color separation plate making industry, and the above is the concept of color separation. I believe that it can be used in the ink color matching. Please try and the result, please give the author.
Mixing environment and precautions
Readers know that when viewing a transmissive sheet or a light sheet, use a 5,000K color temperature light box. What about the reflective document? The same is the 5,000K color temperature for inspection, but in fact, many of the industry will use 6,500K color temperature as the inspection standard. But the same ink will produce different color effects under different color temperature sources, if the total color difference (Color Difference) is greater than 2.0 delta-E, and the difference can be discerned by the naked eye.
Because the ink hue is based on the principle of subtractive color, the equivalent of the primary ink is black. That is, the second color (Secondary Colors) is mixed with the primary colors, or the second color is matched with the second color (Teritiary Colors), which are much darker than the original colors. If the color is blended with the least amount of ink, the vividness and brightness of the color are better, and the brightness is lowered because the gradation is reduced.
Inexperienced mechanics tend to adjust the amount of inks when dispensing spot colors, especially for dark inks. Dark inks are harder to match with lighter inks. Before the blending, the specific gravity of the main color ink and the auxiliary color ink should be analyzed, and the relationship between light and dark should be analyzed. Then, the ink is weighed first, and then the main color ink is used as the focus, and then the auxiliary color ink is slowly added. If the ratio of the primary color ink to the secondary color ink is 9:1, and the secondary color ink is first dosed to 1.5, the primary color ink is then enlarged to 13.5. That is, it becomes 13.5:1.5, and the correct color can be obtained, and the amount of ink is increased by 50%.
When the printing factory prepares a small amount of ink, it uses two ink knives for mixing. After evenly blending, it will apply a very small amount of oil to the paper strip by using the paper squeegee, and then the color sample will be in the standard 5,000K color temperature. The light source is used for inspection, and the ink factory uses a blender and a roller-rolling machine for stirring and grinding when a large number of spot color inks are dispensed.
In addition to the accurate hue of the ink, the printability of the ink is also important, such as tack (Tack), viscosity (Viscosity), and emulsifying rate. The spot color ink remaining after printing can still be adjusted according to the hue of the new manuscript, but the saturation is often gray, especially the remaining ink recovered from the ink fountain, when there is emulsification or printability change, most It is good to mix it into black ink or gray ink.
Calculation of ink usage
The general dosage can be based on the following factors: the number of printed sheets, the area covered by the print, the picture or text, the thickness of the ink layer, etc., all proportional to each other, and the structure of the paper, the smoothness of the surface, the volume and specific gravity of the ink itself, also affect Its ink consumption. The following picture was tested by a Dutch ink factory (VANSON INK) and a suitable amount of ink printing was obtained.