Second, the feature color distinction method is generally experienced prepress workers, use this method to distinguish. Because it conforms to the color separation principle, it is highly accurate to use. We know that after the color separation of the filtered color patches, each color version has its basic color and opposite color. For the magenta version, the basic colors are magenta, red, blue-violet and black, and the opposite colors are yellow, cyan, green and white.
Therefore, all red, blue-violet and magenta should have a deep black color on the magenta color separation film. We can find some relevant feature colors, such as red flags, red seals, characters' lips, etc. These parts should be dark on the magenta version and light on the green version. On the contrary, some sky, sea, forest, etc. are light in magenta and dark in blue.
Third, the angle distinction method This is by means of a magnifying glass, from the color separation angle of the film. In general, the angle of the yellow version is always 90°. This is done in consideration of the characteristics of the weak color version. Because magenta, cyan, and black are strong color plates, it is necessary to avoid the occurrence of moiré, which is usually arranged at an angle difference of 30° from 45°, that is, 15°, 45°, and 75°.
The angle of the strong color version can be determined according to the characteristics of the original, and there is no fixed angle. The yellow color is a weak color version, and even if there is a moiré, the human eye is not easy to observe. For square dots and circular dots, when the fourth ideal angle can no longer be arranged in one quadrant, the angle of the difference is given to it. Therefore, its angle is arranged at 90 °. Note that since the angular arrangement of the chain points is 0 to 180°, it is another matter for the chain points.
Fourth, the network flower differentiation method If there is a sample, you can also use the proofs to carry out the network flower differentiation method. Place a piece of separation film on the proof sheet and turn it slightly at an angle. Some colored net flowers, that is, moiré, appear in the tonal area. If the magenta net flower appears, the film is a magenta version; if it is a cyan net flower, it is a green version. Why is this?
We know that the smaller the difference between the two dot angles, the larger the square pattern is, the more obvious it is. When a monochromatic film is placed on a sample, its angle is the same as the angle of the natural color in the four-color proof. After the film is slightly rotated by an angle, the difference in the true angle between the film and the four-color proof is small. A small angular difference makes it easy to generate an obvious natural mesh.
This will help us easily identify the color of the film. In summary, we can summarize the quick and effective way to distinguish between different color plates.
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