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Background color removal is proposed and implemented for modern color reproduction technology. Started to be used in photo-engraving, according to the principle of using mask technology to operate empirically. In the 1970s, PCR (Programmed Color Reduction) was used in the manual of the Haier electronic color separation machine in Germany. Translated into programmatic color removal; ICR (Integrated Color Removal) is used for full color removal in the manual of the big screen Japanese electronic color separation machine; GCR (GreyComponent Replacement) is used for gray component replacement in American materials. Special circuits or related software implementation.
It is difficult to distinguish in practical application, and it is more flexible in operation. After years of application technology, it has matured. The core is to handle and use the relationship between the three primary colors and the black version. According to the characteristics of the manuscript, the conditions of printability, and the customer's requirements for the product, they can be divided into two categories:
1. The original copy is mainly made of color. This type of manuscript generally has a large density range, rich layers, and bright and bright blocks. There are relatively many primary colors and intermediate colors in the picture. At this time, the three-color version should be reused. On the basis of maintaining the necessary tone, the main color of the screen should be expressed in the three-primary color version as much as possible. The tone is relatively long, the basic color is enough, and the opposite color should be used in an appropriate amount or not. The black tone is relatively short, and the amount of background color removal is relatively small. Medium to dark colors, increase the contrast of the image and improve the adaptability of printing. The black tone level needs to be short and shallow (0% to 50%), some to be short and moderate (0% to 65%), some to be short and brand new (0% to 80%), regardless of the deepest What is the area of ​​the dots, and the starting point is from the middle, focusing on the role of skeleton and reward.
2. The original copy is mainly gradation or achromatic. This type of manuscript is generally rich in layers, simple in tone, and elegant, with non-color as the main tone (such as the focus, thick, heavy, light, and clear ink in Chinese painting). The black version should be used for reproduction. The main tone of the image depends on Black version performance, gray version can be added when needed. The black tone is relatively long, the three primary colors are relatively short on the basis of meeting the requirements of primary and intermediate colors, and the amount of background color removal is increased accordingly, which is conducive to plate making and printing, and it is conducive to reproducing the main tone of the image. Prevent non-color tone yellowing, purple or reddish.
Everything in nature is very rich. According to CY / T23 "Classification of Printing Manuscripts", manuscripts are divided into physical objects, paintings, photographs, electronic manuscripts, etc. In the terminology of image manuscripts, printed matter is also regarded as manuscripts. Each type of manuscript has its own characteristics. When similar manuscripts are made, different customers have different requirements. Although the data used on the equipment or in the software are used, the data used are adjustable, so it is difficult to give quantitative requirements. , Can only give specification requirements.
Originals with color as the main body should use the three primary color versions reasonably, with the three primary colors as the main, the tone is relatively long, the black version is supplemented, the tone is relatively short, and the amount of background color removal is relatively small; The black version should be reused, the tone is relatively long, the tone of the three primary colors is relatively short, and the amount of background color removal is relatively large; if the tone of the three primary colors is long, the black tone is also long, and the image will be gray, dull, and difficult to print ; If the three-primary-color version is short-cut, the amount of background color removal is large, and the black version is short, the image will be gray, flat, thin, discontinuous, and poor three-dimensional. Therefore, according to the characteristics of the manuscript, printability conditions, and customer requirements for the product, in the implementation process, the relationship between the three primary color plates and the black plate is carefully and scientifically handled, and the amount of background color removal is used reasonably to achieve improved product quality and efficiency. purpose.
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