I. Hierarchical Discrimination Method of Handbag Printing in Jinan
For black and yellow, this method is very applicable. Generally speaking, in the four-color edition, the Black Edition is mostly copied in short tones, so the level is very small and easy to identify; because in most works, the Yellow component is comparable, so it seems that the Yellow edition is full, vague and comparable. The magenta version and the green version have the same level. If there is no experience of color separation, it is often easy to confuse them.
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2. Characteristic Color Discrimination
Ordinary experienced pre-press workers often use this method to identify. Because it fits the principle of color separation, it has high accuracy in application. We know that after the color separation of the filter, all the color plates have their fundamental and opposite colors. For example, in the magenta version, the basic colors are magenta, red, blue-purple and black, while the opposite colors are yellow, blue, green and white.
Therefore, all red, blue-purple and magenta should have deep black on magenta color separation film. We can find some related features, such as red flag, red seal, character's lips and so on. These parts should be dark on the magenta plate and light on the green plate. On the contrary, some skies, seas, forests, etc. are pale in magenta and dark in blue.
3. Angle discrimination
This is seen through a magnifying glass from the perspective of film color separation. Generally speaking, the angle of yellow edition is always 90 degrees. This is to think about the features of the weak version to stop the angle layout. Because magenta, cyan and black are strong color versions, it is necessary to avoid the appearance of tortoise lines. They are mostly arranged at an angle difference of 30 degrees from 45 degrees, i.e. 15 degrees, 45 degrees and 75 degrees.
Jinan handbag printing strong color plate angle can be confirmed according to the characteristics of the original, there is no fixed angle. And yellow is a weak color version, even with tortoise lines, the human eye is not easy to see. For square and circular dots, when the fourth ideal angle cannot be arranged in a quadrant, the worst angle is given to it. As a result, its angles are all arranged at 90 degrees. Note that since the angle of the chain point is 0-180 degrees, it is different to discuss the chain point.
IV. Discrimination of Net Flowers
If there are sample sheets, we can also apply sample sheets and stop the identification of net flowers. Put a piece of color separation film on the sample sheet, turn a little, and there will be some color meshes in the color area, that is, tortoise pattern. If the screen is magenta, the film is magenta; if it is blue, it is blue. Why is that?
Jinan handbag printing staff knows that when the angle difference between the two dots is smaller, the larger and more obvious the block pattern is generated. When a monochrome film is placed on the sample, its angle is the same as that of the nature in the four-color sample. When the film is slightly rotated at an angle, the difference between the nature angle of the film and the four-color sample is very small, and this very small angle difference can easily produce a distinct nature net flower.
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