Industry common prepress process

Printing is a process technique that enables a printing plate or other means to transfer graphic information on a document onto a substrate. To achieve this process, you must have originals, plates, substrates, inks, and printing machinery. It is a comprehensive engineering technology discipline. It mainly studies the basic theories of printing science, information processing of printing and graphic arts, printing technology, various types of recording plate materials, printing materials and adaptability. The textual information on the manuscript is made through production and output. Prepress character information processing, also known as text typesetting, is an important part of typesetting and image processing, and it is also an important part of the prepress process. Its right and wrong are directly related to the printing plate and the substrate. Only the correct production output can better print it. Otherwise, everything is useless.

The prepress platemaking mainly includes production, output, and printing. The flow chart for production and output is: External customer commissioner sends manuscripts Internal customer commissioner arranges design and production of the output of the film output.

Each step in the process is important because they all have a causal relationship and are interlocking and indispensable. Only the customer commissioner correctly confessed that the production staff carefully accepted to be revisited as required, the distribution personnel can correctly issue. Inspection is an important part of printing. The professional terminology used in the platemaking is called the school draft. It mainly includes six aspects (1) text (2) image (3) dot (4) appearance (5) logo (6) other. Only by checking it can we ensure the correctness of the film. Of course, the most important thing is to rely on the carefulness of the school draftsman.

It mainly fills the part that the computer can't complete, and uses manual imposition to complete the printing and post-press processing needs. Whether it is manual or computer make-up, it must be baked, PS plate, wash plate, printing plate to continue printing, so that plate making is an important part of the prepress process, are indispensable.

Some of the specifics of the prepress process are as follows:

First, the prepress or computer design workflow in printing generally has the following basic processes:

1 Clear design and printing requirements, accept customer data

2 Design: Including input text, images, ideas, imposition

3 out of black and white or color proofs for customers to modify

4 According to the revised draft

5 Reissue the school draft to allow the client to modify it until finalization

6 Let the customer sign out of the film

7 Prepress proofing

8 Submit the printing proofing so that the customer can see if there is a problem. If there is no problem, let the customer sign it. All work on prepress design is completed. If there is a problem in the proofing, you have to modify it and re-export the film.

Second, the computer design system to complete the design of the workflow is as follows:

1 First, scan the original according to the final size of the image, and adjust the image in the image software. At the same time, you can complete some creative design work.

2 In the graphics or typesetting software layout design work: including input text, draw graphics, put images.

3 After the customer finalizes the document, it sends the document to the output center to output the film. The laser imagesetter works with the Postscript language. The layout is described by the RIP (Raster Image Processor) as a bitmap and divided into four colors: C (Cyan), M (Magenta), Y (Yellow), and K (Black). sheet. If the final design requirement is not an output film, but a large-scale color inkjet sample, then the inkjet printer output is sufficient.

In the prepress image, the printing process determines that the printing can only use the dots to reproduce the continuous leveling of the original. After the original image is screened, the image is divided into countless regularly arranged dots, that is, the continuous adjustment image information becomes discrete. Dot image information. The bigger the dot, the deeper the color of the expression and the darker the layer; the smaller the dot, the lighter the color of the expression, and the brighter the level of expression. The position of the dot space and the size of the dot are two different concepts, such as the meaning of C50%. It is the size of the outlets that account for 50% of the location of the outlets. 100% refers to the total coverage of outlets, which is called "real" in the printing. 0% has no outlets and only the outlets of the outlets, so there is no such place. The ink is printed on. Obviously, the larger the number of hanging nets is, the smaller the space occupied by the outlets is, and the more layers can be described, the more delicate they are. In fact, the level and color of the manuscript are reproduced through this method of hanging the net. So the printed image must be screened.

Why does the image need to have an image file format? There are several image file formats that are often involved in prepress. What is the nature of each? The image file format determines what type of information should be stored in the file, how the file is compatible with various application software, and how the file exchanges data with other files. Since there are many image formats, the format of the image should be determined based on the use of the image.