Gravure printing school drops (on)

Manuscript color processing

At present, there are various color casts in many manuscript drawings. Therefore, correction of color cast is an important content in the color adjustment job and should be mastered as follows:

(1) Color cast positioning:
First, analyze whether the color of the manuscript (including light, disk) is color cast. The typical color cast is mainly reflected in the neutral gray and the color part of the impression. When locating color cast, one is relying on the eyes: the second is to determine whether the color cast is determined by using the value of the suction value and the gray balance of the company. Visual identification of color cast:

1 Whether the black, white, and gray in the image is color cast, because people are most impressed by black, white, and gray, and are most sensitive. It is easy to identify whether the color cast is correct, as long as the black, white, and gray in the image are correct. The tone is correct.

2 See the color of the most familiar parts, such as character skin color, whether it meets children's skin color, young women's skin color, actor skin color and other characteristics of the characters, whether it meets the psychological color of people's hope, whether there is yellow, red, gray, etc. defect.

1 See if the important impressions in the image, such as red, green, orange, tomato, banana, jujube, walnut, strawberry, etc., are in line with the real object of the impression. The colors provided are in color and have no color cast.

(2) Determine what color is biased?
1 Using black, white, and gray as benchmarks, look at what black, white, and gray colors are, and whether they are blue, red, or violet.

2 Based on the color of the character of a person's character and the color of the skin that people's mind wants, they look yellow, red, gray or dark.

3 Based on the true color of objective physical objects, according to the requirements of customers, see what the main color cast of various subjects is. If the red is partial pink, or partial orange, such as green is greenish or yellowish green, or partial gray; such as orange, orange is yellow lack of magenta, or partial product red lack of yellow, or partial gray, etc., Only accurate determination of color cast, what color bias can correct correction?

(3) Correction method:
1 The correction of white tone: First, if there is a layered texture in the white tone, the high-light end tool of the level curve is applied, and the proportion of neutral white dot value is corrected. Second, there is no level in the white tone, then the white block in the school color can be selected. Tool correction.

2 Middle tone gray correction: Using the mid-level tool of the level curve, according to the neutral gray dot value correction, should pay attention to two situations:

One is to observe whether the dot value of the color cast portion is close to the original density value. If the dot value of the color cast portion is deeper than the original density, the biased color plate can be reduced. If the gray color is colder, the C version can be reduced. Both the gray balance and the gray tone are reduced. Second, if the partial color dots of the color cast are shallower than the original, and need to be deepened, the opposite color can be deepened. For example, if the gray color is purple, the Y version can be deepened, which achieves the gray balance and deepens the gray.

3 Black tone correction: First, the tone and black have layers, you should use the dark curve of the level curve tool, according to the ratio of neutral black dot value correction; Second, there is no level in the tone and black tone, you can choose the color The black tool corrects.

4 color correction: color correction, the use of Photoshop software choice of color correction tools Y, M, C, R, G, B hue correction, correction should be depending on the color saturation conditions, such as green biased green , not bright, is to add yellow or reduce the blue, if the yellow dot value has reached 95%, while the cyan is 90%, you should reduce the cyan is 80%. If yellow is 85% and cyan is 80%, dark yellow should be 95%.

Note: When using the correction tool to correct the deviation, it is very sensitive to color with large saturation and color correction. For dark colors, color correction is dull. If the color amount is large, it must be checked out separately to adjust, otherwise it will affect the same color. Department of color changes.

9. How to use the black tone tone to process the current copy of the intaglio color image, how to make good use of the black version and handle the black version is a problem to improve the quality of the gravure printing product. I have seen many platemaking companies fail to deal with the black version. Many waste products have emerged and caused many difficulties in printing, and emergency needs improvement. The author studied in the long-term production practice, summed up the methods and methods to deal with the black version. In some plate-making companies, the company successfully improved the quality of the product, and made the printing better, which was praised by customers.

(1) The original color-based manuscript should be based on the three primary colors, and the black version should be a short-step adjustment skeleton. The black tone tone only plays a role in mental outline.

(2) Some originals with bright tone and medium tone color, with little gray tone and dark tone, there are no black marks such as black characters on the packaging bag, so the black plate is not used and the three-color plate making process is used. If the 谧 谧 谏 group 谏 谏 标志 标志 标志 则 则 则 则 则 则 则 则 则 则 则 则 则 则 则 则 则 则 则 则 则 则 则 color graphics can be used three primary color plate, and the black version dedicated to the black, this solves the printing of the dark part of the image and black out of the plot between the printed words, when printing Both the kill and the darkness of the V value can make the dark part of the color picture not appear dark and get the best of both worlds.

Treatment method The light and dark levels in the color, using complementary colors instead of the black version. Such as (A) the face of the character's shadow and neck, the normal four-color configuration with 10% to 15% of the black version of the small outlets, the printouts appear coarse grain, I take to remove the black version, to 10%? 15% The black version of the dot value was copied onto the cyan version. The printed facial shading and neck skin color appeared smooth and delicate, and the quality was obviously improved. (B) The green lightening level replaced the black with the complementary color and the effect was excellent. For example, in the bright midtone part of green, the original dot value M color version is 23%, K version is 20%, and the K version is replaced by 20%, and the calculation is copied to the M color version, ie, the M color version. It is 43%, so that the green is bright and rich, and it is delicate and not rough.

(3) Some black-based originals, such as "black sesame paste" bags, use long-range blackened version (GCR) technology, which can fully use the black version to express the "black sesame paste" layer texture, It can ensure black stability and color cast when printing. The author made a series of more than 10 kinds of "black sesame paste" packaging products in a plate-making company, adopting GCR long-range dark edition process, the setting values ​​are: (A) high-light part of the required level, K7%? 8%, C4 %, M3%, Y3% (C, M, and Y are not transferable when printing. In fact, only black dots, C, M, and Y are placed at 4%, 3%, and 3%, respectively, mainly to make high-light levels. (Xin? continued transitional); (B) Shadowing part, K90%, 95% of the local deepest, C75%, M72%, Y72%, excellent printing effect, the customer is quite satisfied.

(4) Due to the coarse black ink particles and the use of high network cables in order to ensure the accuracy of black letters, the dots are expanded more during printing. Generally, the medium and low speed printers are almost 80% or 85%.愦味愦 10.? Therefore, the black version of the dark part of the image should be handled in two ways: First, the black version of the dark tone should be consciously opened; second, the amount of black can not be set? Every dark, the best is 70. % 5% of the earth, making it a distance away from the black characters outside the map, so as to ensure that black characters can be printed in depth when printing, and image darkness can maintain the level.

(5) Pay attention to the difference between the darkness of the object and the black object. The shadow of the object is black, ie the black part cannot be deep. To maintain the level, the black version of the black object can be deeper, and the black part can reach 80% or so. . Many operators nowadays often treat the shadow black of an object as a black object, setting the black plate deep, causing the printed product to darken darkly.

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