Ink deployment

When meeting spot colors and spot color printing, the technicians are occasionally asked to assign color inks based on what theories and methods are used when they are assigned. They all say "by experience." The mind always thought, how can the deployment be "disorganized?" There is always a basis for it.

Ink subtractive inks are based on the three primary colors of pigments, yellow, magenta, and cyan. They are non-luminous, and their characteristics are absorption (or subtraction) of one-third of light in white light, and reflection of two colors of light. , like yellow, it absorbs (or subtracts) the violet-blue light in the white light, reflects the red and green light, and the two colors are combined to give a yellow color, the magenta absorbs the green light in the white light, and the blue light Absorb red light in white light. Therefore, the three primary colors of ink are called Substractive Primaries or Substractive Primary Colours.
The characteristics of the color The nature of the ink color depends on: Hue, Saturation, and Luminosity. The hue is because the color light reflected by the ink has a certain wavelength in the visible light spectrum, and this wavelength is the hue of the ink color or the appearance of an ink color. Saturation refers to the purity of color. When the purity is the highest, it is based on the theory of the ink subtractive method that absorbs (or subtracts) the three-point light and the reflected three-point light. Brightness refers to the amount of light reflected off the surface of the ink, and directly produces different light and shade levels, while the hue of the ink color is constant.

The second color is the color of the primary color ink. Such as red = yellow + magenta, green = yellow + blue, purple blue = blue + magenta. When the three primary colors are deployed in equal amounts, it is the central gray level. When the original color ink is mixed with another ink, the gray scale and brightness are reduced.
The deployment of spot colors will use the density meter to measure the original color ink. After drawing the right picture, the hue and saturation of the ink and the relationship between them can be viewed. That is, 1:1 for each of yellow and magenta, 1:1 for yellow and cyan, 1:1 for magenta and cyan, and red, green, and blue-purple blends. From the figure can also see the complementary relationship between the various colors, such as yellow and purple blue, magenta and green, cyan and red, when the deployment of ink hue color deviation phenomenon, such as hue green, you can add a small amount of magenta, partial purple blue When adding a little yellow, reddish, fill in blue.
The technician can measure the company's existing ink and draw it out. More base inks, such as Warmred Gold Red, Gloss Bronze Blue Gold Blue, Reflex Blue Light Blue, Rhodamine Red Plum Red, Green Green, Violet Ching Lin, and Fluorescent Huang 803C, Fluorescent Red 806C, etc., as a basis, the expansion of the color gamut makes it easier to grasp and deploy spot color inks. As for the deployment of brightness, appropriate amounts of transparent and black ink can be added.
The author is engaged in color separation and plate making industry. The above is the concept of color separation. I believe it can be used when using inks. Try and result, please give the author.
Deployment Environment and Precautions The reader knows that when viewing a transmissive film or a light film, use a light box with a 5,000K color temperature. What happens when a reflective document is viewed? The same view is taken at a color temperature of 5,000K, but in reality, many peers will use the 6,500K color temperature as the inspection standard. But the same ink will produce different color effects under different color temperature light sources. If the Color Difference is greater than 2.0 delta-E, the naked eye can already distinguish the difference.

Because the hue of the ink is formulated based on the principle of subtractive color, the equal amount of the primary ink of the niobium forms a blackish color. That is to say, the primary colors are mutually mixed to obtain the secondary colors, or the secondary colors are mutually prepared to obtain tertiary colors (Teritiary Colors), which are much darker than the primary colors. If the color is formulated with the minimum amount of ink, the vividness and lightness of the color are better because the grayscale is reduced and the lightness is high.
Inexperienced craftsmen often use more special colors to adjust inks, especially dark ink. Dark ink is more difficult to deploy with lighter inks. Before deployment, the proportion of the main color ink and the auxiliary color ink should be analyzed. The relationship between light and shade should be analyzed. Then the ink should be weighed. The main color ink should be the focus first, and then the auxiliary color ink should be slowly added. If the ratio of the main color ink and the auxiliary color ink is 9:1, and the auxiliary color ink is first weighed to 1.5, the main color ink is then magnified to 13.5. That is, it becomes 13.5:1.5 to get the correct color, and the amount of ink increases by 50%.
When a small amount of ink is dispensed by a printing plant, two ink knives are used for mixing. After evenly mixing, a very small amount of oil is applied to the powdered paper strip using a paper stick and ink, and then the color sample is measured at the standard 5,000K color temperature. Under the light source for inspection, and ink factory in the deployment of a large number of spot color ink, the use of mixers and roller grinding machine grinding and grinding.
In addition to the hue of the formulated ink, the printability of the ink is equally important, such as tack, viscosity, emulsification, and the like. For the spot-colored, spot-colored inks, they can still be formulated according to the hue of the new manuscript, but they tend to have a grayish saturation, especially the residual ink that is retrieved from the ink fountain. The emulsification or printability has changed. Good or black ink or gray ink.
The amount of ink used can be calculated according to the following factors: the number of printed sheets, the area covered by the imprint, the picture or text, the thickness of the ink layer, etc., are proportional to the structure of the paper, the smoothness of the surface, and the volume of the ink itself. The proportion also affects its consumption of ink. The following chart was tested by a Dutch ink factory (VANSON INK) to obtain a suitable amount of printing ink printing table:
For example, a full version of black ink is printed on pink paper, and each inch of ink can print 425,000 square inches of paper. The concentration of ink is confirmed by the concentration meter. The reader can also browse http://, there is a small Toolbox inside. The tool ink Estimator can be used to calculate the amount of ink, or to purchase the Graphic Arts Handbook of the Graphic Arts Society, which includes the calculation method proposed by “Gao Ink Co., Ltd.”.