Color simulation method for digital proofing

Abstract

The invention discloses a color simulation method for digital proofing, which comprises the following steps that color information and a dot gain value in actual printing process conditions are measured, the dot gain value is utilized to directly perform dot gain on an electronic file before RIP (Raster Image Processing), during RIP or after RIP, the electronic file after the RIP after the dot gain is used, and a digital printer without the dot gain during printing is used for digital proofing. The color simulation method for digital proofing has the advantages of easiness in operation and precise simulation, and the WYSIWYG (what you see is what you get) effect of digital proofing is achieved.

Description

technical field [0001] The invention belongs to the technical field of printing and relates to a color simulation method for digital proofing before printing. Background technique [0002] In order to achieve the purpose of "what you see is what you get", before printing, it is necessary to use software to display the electronic files for printing on the computer screen; in many cases, it is necessary to use professional inkjet printers and professional printing paper. Print out the electronic file, that is, digital proofing, for customer confirmation, and accept the final print as an attachment to the contract. [0003] Therefore, "digital proofing = printing sample" is the goal of efforts before printing. In order to achieve this goal, it is extremely important to accurately simulate each color. [0004] For products that are all solid color blocks, it is relatively simple. It only needs to measure the L*, a*, and b* values ​​of each color block to prove that their colors...

AI Technical Summary

Problems solved by technology

But for the vast majority of prepress files contain dots, how to simulate the color of these non-solid areas becomes very difficult

[0005] For example, the completed color separation electronic file contains patterns of various dot ratios in the finished document (such as ai format or pdf format), and 50% of the dots have a dot size of 50%. After rip, the generated tiff The dots in the file are still 50%. When digital proofing, you need to use the preset printer compensation curve to print 50% of the dots into 67% to simulate the dot expansion during printing. When using this electronic file for plate making, different plate making The factory needs to add different process curves or experience curves. For example, 50% dots on the printing plate reflect 38%. Printing under certain conditions, the actual dot ratio of the 50% dot area of ​​the printed matter is 73%; so 67% There is a color difference between the digital proof and 73% of the printed matter. Although the 50% dots of the digital proof can be displayed as 73% of the actual value through detailed adjustments, once the color and printing process are changed, a large number of tests will need to be re-conducted and adjustment work; and each feature point of 1%-99% needs such measurement and adjustment, which is very troublesome and complicated

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