Chocolate Boxes Of Layered plates Spot color prepress treatment in direct plate making process

Chocolate Boxes Of Layered plates Spot color prepress treatment in direct plate making process

With the development of printing technology, four-color printing has been unable to meet the color requirements of beautiful products in some aspects, and the application of multi-color printing is gradually becoming more extensive. In the desktop plate making technology (CTF) process that we are familiar with, multi-color printing can test whether the ink matching, spot ink and four-color ink edge overlap is reasonable through film, plate printing, proofing, because the cost is very low, you can modify the document and film proofing, repeated experiments to customer satisfaction before printing. In the computer direct plate making process, we see a digital sample before publication, it will never appear color leakage or heavy color phenomenon, but in the printing of the post-process, even if the CTP version, error is inevitable. This error can only be remedied in the process of making documents by Trappmg and stamping or removing the documents according to different circumstances. Therefore, in the CTP process, the pre-press treatment of spot color is particularly important.

Generally speaking, the color of the ink is different, the size of the leak white is different; Spot color and four-color color collocation is different, and the way of filling the leak white is different.

1. Dark spot colors are connected to light colors

The dark spot color is connected to the light color, and the light color is Trapping to the dark color, and the value is generally between 0.02 and 0.15mm.

2. The dark spot color is connected with the darker four colors

When the dark spot color is connected to the darker four colors, the value of Trapping is usually 0.05-0.15mm from small to large area. In PackEdge software, the value of Trapping after 0.05-0.15mm is automatically imprinted. In CoreIDraw the principle is the same, but the processing method is different, and it is more troublesome.

3. Color text on spot color

For the color text on the spot color, regardless of the color collocation, the text should be used as the Trapping of the base color to ensure that the text shape remains unchanged. In CorelDraw, after the text is turned into a graphic processing, in the four-color layer according to the size of the word fill the same color edge line can achieve the effect of filling the leak.

In CorelDraw and Photoshop, spot colors of raster images can be processed through layering or multi-channel methods, but in PackEdge, because it receives files in the formats of PS, EPS, TIFF and PDF, it can directly Trapping vector graphics and text, but the spot color effect of the image will change. There is no way to talk about Trapping, so we can only select the mask of different images and refill the spot color, and the effective images, such as blacking, overshooting and feathering, must be redone in PackEdge, which is more natural than CorelDraw and Photoshop, and the transition ladder is much smaller. Color uniformity is the biggest advantage of overdoing PackEdge.