Color standard application (one)
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When do you use color markers?
In order to obtain the most ideal process, further control of the production process, each sample of each job, whether it is a pre-sample proof or a digital proof, and each color plate printed should contain a color code. In the actual printing production process, it is often unacceptable because the cutting size and the size of the printing machine occupy the entire imaging area, and there is not enough space to place the color standard. If this phenomenon occurs frequently, the operator can operate as follows:
· Intentional printing of color standards, such as once or twice a week, to make test plates or directly into a production version containing this information, so that operators, managers and related technical personnel can understand the printing plate, printing Changes in machine performance, paper, ink, and other input parameters.
· With the permission of the printing client, some target elements, such as dot gain, density and gray balance, are selected somewhere in the printing plate. This information will not cause opposition from the printing customers. In fact, some customers have included these elements. In the layout, and remind the reader that these color blocks are used for quality control.
· Negotiate with the print customer to include test objects in the edit design.
· Add a 75% tonal value and a solid color patch for each color at least somewhere on the plate to measure the print contrast, which helps to estimate the overall print quality and the relationship between density and dot gain.
It should be noted that color standards are not a prerequisite for printing high quality images; many printers and color separation people can produce high quality products without using color standards. Moreover, many printers and color separation personnel are more profitable when they do not use color standards. However, printing and color separation personnel who rarely use color standards can achieve higher profit and quality levels than those who include and use color standards. Color scale is a key factor in proofing and printing in high-productivity and high-profit production methods. Color markers can be used to determine process changes faster and more purposely, avoiding errors and distortions in image appearance. Since the color code can be objectively measured, it can provide the parameters and information necessary for process improvement, which helps to continuously improve quality and reduce costs.
When do you measure the color code?
In actual production, the color code should be measured frequently. Here are some suggestions based on the information published by Gretag, which is helpful for training production operators:
In the preparation of the printing and color confirmation (ok) process, the operator often uses a correct proof or pre-sample proof as a color reference, relying on visual adjustment. Even in this print preparation phase, the color scale is useful because the operator can use the color scale:
. Detect density, dot gain, contrast, and other data that needs to be validated to determine if the printing process can achieve the desired results.
· Understand the problems that may arise during the printing preparation process and ensure that the printed sheets match the proofs. At the end of the printing preparation process, the role of the color scale has been further expanded. At this stage it is recommended to measure the following elements of the main page and the ad under standard conditions:
· solid color blocks for each color;
· 25% and 50% color patches for each color, as well as print contrast;
· Two-color overprint blocks (red, green, and blue blocks) of solid ink. During the printing operation Under normal conditions, measure the following elements of the main page or advertisement:
· solid color blocks for each color;
· 25% and 50% color patches for each color, as well as print contrast;
· Two-color overprint blocks (red, green, and blue blocks) of solid ink. After performing ink supply adjustment or printing downtime, measure:
· 25% and 50% of each color of the main page or ad and print contrast.
If these quick initial measurements show unusual values, or if the entire process is unstable, the operator should measure other color-coded elements on the substrate and increase the frequency of the measurements to keep track of changes in the press. Process, make appropriate adjustments. In these examples, a device running chart or an X control bar/R chart is invaluable because it will provide us with some information, and we can determine whether the process has undergone a major change or a normal float. These recommendations are only the starting point for the development of internal operating procedures and guidelines; in particular, companies using statistical process control (SPC) often have their own experiments and measurement methods.
What measurement elements are included on the color scale?
The color scale usually contains two types of elements:
Objective elements such as density elements, 25%, 50%, and 75% of the texture, overprint, and other elements that can be evaluated with a densitometer or other color measurement device.
Subjective elements Ghost elements, plate exposure indicators, gray balance tones, and graphical elements that are visually evaluated.
The measurement of these two types of elements is very important and very useful, because visual objects can provide immediate information about unacceptable changes to the operator and the measurement process. These changes can be verified, quantified, controlled, and finally by objectively measuring other objects. record it.