What are the ways to distinguish between printing plates
In printing, there is a concept of printing plates, I don't know how much you know about printing plates, printing plates, which are treated into a part of the printing plate that can be transferred to the printing ink, and the other part does not transfer the printing plate. The interpretation of the national standard is: "For the purpose of reproducing graphics and texts, it is used to transfer the coloring agent/pigment (such as ink) to the simulated image carrier on the substrate." "The graphic information on the original manuscript is made on the printing plate, and there are graphic and non-graphic parts (non-image area) on the printing plate, and the graphic part on the printing plate is the inking part, so it is also called the printing part (printing area), and the non-graphic part does not adsorb ink during the printing process, so it is also called the blank part (non-printing area).
So what are the ways to distinguish between printing plates? The following is a brief introduction to this knowledge. The common methods of distinguishing printing plates are mainly divided into the following four types, namely hierarchical differentiation method, characteristic color differentiation method, angle differentiation method, and mesh flower differentiation method, each method has its own advantages and disadvantages.
1. Hierarchical differentiation method
This method is very practical for black and yellow. Generally speaking, in the four-color version, the black version is mostly reproduced in short tones, so there are very few layers and it is easy to identify; Since the yellow component is relatively heavy in most of the works, it seems that the yellow version is very full and mushy, and it is easier to recognize. The magenta version and the green version are almost the same level, and if there is no experience in color separation, it is often easy to get confused with this method.
2. Characteristic color differentiation method
Generally, experienced prepress workers use this method to distinguish between them. Since it conforms to the principle of color separation, it is highly accurate to use. We know that after the color separation of the filtered color sheet, each color version has its basic color and opposite color. For example, the magenta version has its basic colors of magenta, red, blue-violet, and black, and the opposite colors are yellow, cyan, green, and white.
Therefore, all reds, blue-violet, and magenta, should have a deep black color on the magenta's dichroic film. We can find some related characteristic colors, such as red flags, red seals, lips of the characters, etc., which should be dark on the magenta version and light on the green version. On the contrary, some sky, sea, forest, etc., are light on magenta and dark on teal.
3. Angle differentiation method
This is viewed with the help of a magnifying glass from the perspective of the film's color separation. In general, the angle of the yellow plate is always 90°. This is due to the angle arrangement taking into account the characteristics of the weaker version. Magenta, cyan, and black are strong color versions, so they must avoid turtle patterns, and are mostly arranged with an angle difference of 30 degrees 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. Yellow is a weak version, and even if there are turtle lines, it is not easy for the human eye to observe. For square dots and circular dots, the worst angle is given when a fourth ideal angle can no longer be arranged in one quadrant. Therefore, its angles are arranged at 90°. Note that since the angular arrangement of the chain points is 0~180°, it is a different case for the chain points.
Fourth, the net flower distinction method
If there is a sample, you can also use the sample to distinguish the net flower. When a piece of separated film is placed on the proof, and a slight angle is turned, some colored nets, known as tortoises, appear in the tonal area. If a magenta mesh flower appears, the film is a magenta version; If it is a cyan net flower, it is a cyan version. Why is that?
We know that the smaller the difference between the angles of the two dots, the larger and more obvious the resulting square pattern. When a monochrome film is placed on a sample, its angle is the same as the angle of the natural color in the four-color sample, and after the film is slightly turned at an angle, the difference between the angle of the film and the natural color in the four-color sample is very small, and this small angle difference can easily produce a clear natural color screen. This helps us to easily identify the color of the film. To sum up, we can summarize a quick and effective way to distinguish between different color plates.
By the time you've read the above, you already have an idea of how to distinguish between printing plates.