In flap book printing, although the increasingly sophisticated technology of graphic information processing has brought more and more advantages to prepress processing, various manuscripts from different customers cannot fully meet the requirements of flap book printing. Common problems such as "missing font", "low graphic resolution", "garbled document editing", "color setting does not meet the requirements of flap book printing", lack of links, and insufficient size are all problems encountered in flap book printing.

With the opening and socialization of the prepress process, more and more designers are making manuscripts and participating in the prepress process, which has caused a serious problem. Due to the lack of professional flap book printing training, many people lack the necessary knowledge of flap book printing. The designed manuscript cannot be reflected on the back track of flap book printing, or it cannot be realized at all. The flap book printing deviates from the designer's design intention. That makes it very difficult to flap book printing good flap book printing.

Let's take a look at the details "color" and "image" that are easy to overlook in prepress operation

The first color above: when making plates, the original manuscript is also divided into blue (C), magenta (M), yellow (Y), black (K), color drawings or color photos, and there are thousands of colors on the screen. It would be almost impossible to flap book printing in all these colours. flap book printing factory adopts the method of four-color flap book printing, that is, the original manuscript is decomposed into blue, magenta, yellow and black four-color plates, and then the color synthesis is carried out for flap book printing. The so-called "color separation" is based on the principle of subtractive color method, the use of red, green, blue, three kinds of filters of different wavelengths of color light has the selective absorption characteristics, and the original manuscript is broken down into yellow, product, blue three primary colors, in the process of color separation, the color absorbed by the filter is the complementary color of the filter itself, so that on the sensitive film, the formation of black and white image negative, and then add screen, Enough to turn negative, after copy, print into a colorful plate. This is the principle of color separation in photography.

Due to the development of flap book printing technology, it is now possible to separate the color of the manuscript through prepress scanning technology, sample and convert it into digital information, that is, to divide the color of the manuscript into red (R), green (G) and blue (B) in the same way as photographic plate making, and digitize it. Then the digital information is decomposed into blue, magenta, yellow, black and four-color information by mathematical calculation.

The next step is image processing:

The common point of graphics and images in design is that they can form visual information and have "graphic" characteristics. The difference is that graphics focus on describing and displaying the shape characteristics of the object, while images focus on reflecting the face of the object. In computer processing, graphics are generated according to the graphics algorithm and stored with the relevant parameters of the image, through the computer calculation drawn straight lines, circles, rectangles, curves, geometric graphics, engineering drawings, CAD, 3D modeling, etc., these graphics are based on the model, function, parameters, algorithms, etc., with "vector" characteristics, so called vector graphics. The feature of large vector graphics is that the file is small, and there is no distortion whether it is enlarged, shrunk or rotated.

In the early stage of flap book printing, when color and image are designed, the line width of the outline line should not be less than 0.1mm. The width of the negative line should not be less than 0.12mm. Too thin, flap book printing will cause broken line, loss or unclear picture. If the image is not handled properly when compressed, it will also cause image distortion, resulting in obvious jagged, which is also a noteworthy way.

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