Whether the color separation technology is no longer needed

At present, if the CMYK files received by many printing factories are directly output to the printing plate for printing, the printed results cannot match the color drafts from the customers, or the colors and levels of the pictures are not good.The biggest reason is that the customers come to the files Improper handling of "color separation". There are two common examples. One is that the total ink volume of the CMYK file is too large, because some software sets the total ink volume to 400%. There is too much ink in the same position during printing, which causes the ink to dry too slowly. There is a phenomenon of bottom and drag. Printing on uncoater paper, commonly known as book paper, is not only difficult to dry because the ink is too thick, but it also causes deep dots to stick together and the level is unclear. The second example is that the designer relied on the effect of the printer to print in the production process. When the print was dark and color, they had to modify the file until a satisfactory color draft was printed, but the CMYK value of such file is fundamental. Not suitable for printing. An example that the author has seen is that the value in a location in the file is 8%, but the color tone measured by the customer at the same location is 24%. If you know printing, friends will realize that 8% of the dots are too small. Under normal printing conditions, how is it possible to print 24% shades?

The above situation follows the desktop publishing (Desk top Publishing) revolution initiated by the Apple Macintosh desktop computer in 1985, which has revolutionized prepress technology. The previous prepress processes include art design, image processing, and typesetting And color separation can be done in a desktop computer. Make the work of the past professional process easy through computer and software operations, so many professional jobs fall on the hands of non-professional personnel. The designer must take on multiple jobs and must understand typing, image processing and color separation. Work, but do they have enough expertise? In addition, the word-planting and color-separating industries have been gradually eliminated!

In the course of teaching color management and related courses, the author asked what “color separation” is. Most of the students said they did n’t know. When asked this question among friends in the printing industry, many people thought that the work of “color separation” was no longer Exist again. Friends who have entered the industry in recent years have no knowledge of the work of "color separation", but for a while in the industry, they thought that without the film and film of photography, they would no longer need the work of "color separation".

In many people's minds, the "color separation" is the original manuscript ?? 诘 缱 childish ?? Mou AЧ 鐾 采 希 ???? ??? 椤 ⒎ childish? Fluttering? Benzene 涑 鲇 type? 愕 乃 纳? Screen Zheng pu? Amine amine? Thin F 涫 di quality times bath amine amine? Barium refractory guanidine yin? PMT-Photo-Multiplier Tube or CCD-Charge-Coupled Device converts the color and light and dark information on the original into electronic information, which becomes the pixel of the image, which is called "scanning" (Scanning). The scanned RGB image is converted into a CMYK image by ICC profile or color setting. This process is called "color separation".

The completion of the CMYK file output film or printing plate, this is called "output" (Output), so the three processes of "scan", "color separation", "output" add up to the previous definition of "color separation" .

Because of the popularity of desktop computers and software, many people can easily complete "color separation", but ask what is the setting behind the process of converting RGB to CMYK, most people say they don't know, then the CMYK file separated by color Whether it is suitable for actual printing conditions is unknown.

To understand the role of color separation, we start with the principle of color reproduction. In the traditional film photography color transparent film, the RGB filter is used to record the images on the CMY three-layer color film. The CMY three-layer color on the color film is the principle of the subtractive color method to form different colors.

Convert the transparent image information to the image information of GB, A, M, A, X, A, B, M, GB, and convert the RGB values ​​into RGB working color space, such as AdobeRGB or sRGB, through Scanner ICC profile or scanning color settings. In digital photography, the image is captured by RGB CCD, and then converted to RGB working color space by the ICC profile of the digital camera. Generally, small digital cameras use sRGB, while professional digital cameras mostly use AdobeRGB.

When the image is stored in RGB mode, it can be converted to CMYK mode through appropriate software. The most widely known software is Adobe PhotoShop, in addition to other software such as CMYK Production + and Photo Retouch Pro from Binuscan, ICISS and Alwan from Aurelon The company's CMYK Optimizer and most of the color conversion functions within the output RIP.

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Despite the help of color separation software, the operator must also have an understanding of printing and color separation technology, such as what is the standard printing density, dot increase, overlap rate, printing contrast; color separation aspects such as color correction, Common knowledge such as gray balance, tonal range, color contrast shadow, black plate generation, GCR, UCR and total ink volume can only understand the function of the software, separate good image file cases, and print out the ideal color effect.

The author enrolled in Kwun Tong Institute of Technology in 1976 for the three-year part of the fake photo-engraving course, learning the traditional color separation engraving technology. By the technology of lens filter color separation, horizontal photo machine Internet access, direct magnifier direct color Internet access and other technologies, learn to operate the electronic color separation machine in the last year. At that time, it took 3 to 5 years for apprentices of color separation technology to be full. At present, there is no "color separation" in the design and printing courses, and there is no apprenticeship training in the "color separation" industry. I believe that the technology of color separation will soon be lost. Therefore, the education industry should establish an appropriate color separation course. , And the industry should also retain the position of color separation technician.

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