When to use color scale for image quality measurement?
In order to obtain the most ideal process and further control the production process, each sample of each job, whether it is a pre-proofing sample or a digital sample, and each color plate printed should include a color mark. In the actual printing production process, it is often an undesirable situation because the cutting size and group size of the printing machine occupy the entire imaging area, and there is not enough space to place the color mark. If such a phenomenon occurs frequently, the operator can operate according to the following methods:
Intentional printing of color marks, for example, once or twice a week, as a test plate or directly as a production plate containing these information, so that operators, managers and related technical personnel can understand the plate and printing machine Changes in performance, paper, ink, and other input parameters.
With the permission of the printing customer, in a certain place of the printing plate, select some target elements, such as dot expansion, density and gray balance, etc., this information will not cause the objection of the printing customer. In the layout, and remind the reader that these color blocks are used for quality control.
Consult with the printing client to include test objects in the editorial design. USA Today is such an example, their logo is the solid ink density and overprint control object.
At least somewhere in the printing plate, add 75% tonal values ​​and solid patches of each color to measure printing contrast, which helps to estimate the overall print quality and the relationship between density and dot expansion.
It should be noted that color coding is not a prerequisite for printing high-quality images; many printers and color separation personnel can produce high-quality products without using color coding. Moreover, many printing industry personnel and color separation personnel are more profitable without using color marks. However, few printing and color separation personnel who do not use color marks can achieve higher profits and quality levels than those who contain and use color marks. Color coding is a key factor for proofing and printing in high-productivity and high-profit production methods. Through color coding, process changes can be determined more quickly and purposefully to avoid errors and distortions in image appearance. Because the color scale can be objectively measured, it can provide the necessary parameters and information knowledge for process improvement, which helps to continuously improve quality and reduce costs.
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