Consideration of digital collage in the most popul

Consideration of digital collage in prepress process

1 basic process of digital collage

1.1 define the attribute of large edition

① define the size, resolution and number of lines of the large version

② define the number of pages and the arrangement of rows and columns of the small version on each large version

③ set the binding mode, printing mode and folding mode

1.2 define the attributes of the small version: the area of the small version, the position on the large version, the spacing of the small version, and the four timely tightening; Peripheral boundary, orientation of small version (head to head, foot to foot), etc

1.3 define bleeding

1.4 page order: due to different binding methods, the page order is also different

1.5 mark setting: including the size and position of cutting, folding, registration, ridge mark and test strip

2 several factors to be considered in making a big version account for 6.4% of the company's total employees (15600 people)

2.1 rip methods are different

① make a big version before rip

first make a big version of the page and then send it to rip, which is the most commonly used method at present. It is characterized by first completing the typesetting and trapping of each page, then making a large version of each page, and making an output file containing OPI (open prepress interface) instructions (for calling high and low resolution images when used in RIP), and finally sending the document to rip for processing. The disadvantage is that you have to wait for the whole page to be assembled before rip, and if you find an error in the page, you must go back to the original software and modify it before making up and rip, and rip interpretation is more time-consuming, so the efficiency is relatively low

② rip and then make a big version

rip page first. This workflow simplifies the cost expansion and modification of the final document into the paper packaging market. If you find a typographical error in a page, you only need to rip the page again after correcting the error and replace the original wrong page, which is much easier than remaking the whole large version of rip. The disadvantage is that the file after Rip is generally large, and there are certain requirements for file transmission and storage. This typography is the future development direction

2.2 different ways of making up

folding and hand splicing are mainly used for samples, books, picture albums and other printed materials that need folding. The process of making up is relatively complex, which requires operators to have some professional knowledge of printing and post press processing. For example, the size and weight of printing paper, the way of printing and folding, etc

free spelling is mainly for the purpose of saving materials (film). Its spelling method is relatively simple, which is mainly to put together different documents of different sizes to maximize the effective use area of film. However, when composing documents printed on the same machine, you also need to have a certain understanding of the printing method

2.3 different printing methods

① double sided printing

most printing sheets are printed on both sides. Double sided printing is one way. Double sided printing requires an operating device between the printing units to pull the printing sheet to the other side, while allowing the rest of the units to print the second side. This kind of printing machine with facilities that can turn the printing sheet is called double-sided printing machine

② single sided printing

another way to print the second side is by processing the printing sheet. This means printing the other side after the first printing. The printer operator takes back the sheet and prints the other side

for single-sided printing machines, there are three printing methods: self turning, rollover and positive and negative printing. The difference between them is how to deal with the printed sheet after the first side is printed

* self turning

self turning refers to that the front and back of a print are on the same printing plate, the long side of the paper is the mouth edge, and the first side is turned over after printing, and the paper teeth on this side remain stationary. This means that when on the second side, the paper gripped by the printer is the same as that on the first side. After printing, cut in the middle of the paper to get two complete copies of the same print

* rollover

rollover is similar to self rollover, except that after the first side of the printed sheet is printed, the paper does not turn over, but rolls. This means that the paper jaws are not on the same side of the paper. Rollover has been rarely used, mainly for prints that cannot be self reproduced

* front and back printing

front and back printing means printing the second side of the page with different printing plates. For a front and back page, you need two separate pages - each for one side printing

2.4 different folding methods

different folding methods mean different page distribution on the layout, so when making a large version, we should consider what the post press folding method is

2.5 other factors 2. Good heat resistance

① bleeding

② binding method. The application can support wireless binding, horse riding binding and other common binding methods

user defined margins and staples. When the correct reading of a book or document is restricted, the space between two pages must be defined

accumulating these blanks helps to accommodate plate layout such as crawling and bottleneck status, and to place scattered pages on the marking map

③ creep. Creep changes according to the paper thickness. It is possible that each living part has different crawling characteristics. The operator can type the paper to make the application adjust automatically

④ bottle state. The bottle state means that the paper is not square after being folded. The bottle shape state changes with the folding mode and binding mode. Make sure that the application allows different changes to be entered to achieve the minimum bottle state

⑤ size and placement of cutting, folding, registration, spine marking, test strip

source: Printing World Author: Ji Yongqin