一、濟南手提袋印刷的層次辨別法
I. Hierarchical Discrimination Method of Handbag Printing in Jinan
關于黑色和黃色來說，這個辦法十分適用。普通來說，在四色版中，黑版多以短調復制，因而層次十分少，很容易識別;由于在大局部作品中，黃色的成分都比擬重，所以看起來黃版的層次很滿、很糊，也比擬好認。而品紅版和青版，層次都差不多，假如沒有分色的經歷，用這個辦法常常容易搞混。
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.
濟南手提袋印刷
Jinan Handbag Printing
二、特征色辨別法
2. Characteristic Color Discrimination
普通有經歷的印前工作者，多用這個辦法來辨別。由于它契合分色原理，因而，運用起來精確性很高。我們曉得，經過濾色片的分色后，各色版都有其根本色和相反色。如品紅版，其根本色是品紅、紅、藍紫色和黑色，相反色是黃、青、綠和白色。
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.
因而，一切的紅色、藍紫色和品紅色，在品紅的分色膠片上都應該有很深的黑色。我們能夠找到一些相關的特征色，如紅旗、紅色印章、人物的嘴唇等等，這些部位在品紅版上都應該是深色，而且青版上則是淡色。相反，一些天空、大海、森林等，在品紅上則是淡色，而在青版上是深色。
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.
三、角度辨別法
3. Angle discrimination
這是借助放大鏡，從膠片的分色角度上來察看的。普通來說，黃版的角度總是90°。這是思索到弱色版的特性來停止角度布置的。品紅、青、黑由于是強色版，因而必需避開呈現龜紋，多以跟45°相差30°的角度差來布置，即15°、45°、75°。
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.
濟南手提袋印刷強色版的角度可依據原稿的特性來肯定，沒有固定的角度。而黃色是弱色版，即便呈現龜紋，人眼也不易察看得到。關于方形網點和圓形網點來說，當在一個象限中無法再布置第四個理想角度時，差的角度就給了它。因而，它的角度都是布置在90°。留意，由于鏈形點的角度布置是0～180°，因而，關于鏈形點則另當別論。
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.
四、網花辨別法
IV. Discrimination of Net Flowers
假如有樣張，還能夠應用樣張，停止網花辨別法。將一張分色膠片拼放在樣張上，稍稍轉一個角度，在色彩區部位會呈現一些帶顏色的網花，即龜紋。假如呈現的是品紅色的網花，則這張膠片是品紅版;假如是青色網花則為青版。這是為什么呢?
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?
濟南手提袋印刷的工作人員曉得，當兩種網點角度相差越小時，其生成的方塊花紋則越大，越明顯。當把一張單色膠片放在樣張上時，它的角度與四色樣張中的本性的角度是一樣的，膠片略微轉一個角度后，膠片與四色樣張中的本性角度差很小，這個很小的角度差就很容易生成一個明顯的本性網花。
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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