Customer: "Hello, hello!"
Engineer: "Hello!"
Customer: "Are you Chen Gong?"
Engineer: "Yes, may I help you?"
Customer: "Why use CTP, there are still differences in color, isn't it good to use CTP?"
………
The above is a telephone conversation between the customer and the engineer.
Why is there a difference in color when using CTP? Let's first analyze the misunderstandings of customers. First, there are two major misunderstandings of customers: the confusion of the concept of plate making and printing plate output, and the confusion of color management and color correction.
If you can't know these four concepts highly, you will step into an abyss that can't be extricated, and will bring you infinite distress from then on ...
What is plate making?
Plate making is a general term for copying originals into printing plates.
The basic requirement of plate making is to be faithful to the original. If the design staff is making a copy, if the color reproduction is biased, it will be required to correct the color. This is why, the clothing album or art album must be proofed 2-4 times. The reason, or maybe more ...
What is plate output?
The printing plate output is the electronic document page submitted by the customer in the printing plate output center. According to the printing and binding requirements, it is assembled into a large version to output the printing plate. The basic requirement is to be faithful to the document page, according to the printing plate output compatibility and printing technology range. Keep as much content as possible on the page. This is what you see between professional graphic production software and office software, and the difference between printed PDF and certified PDF.
What is color management?
Color matching problems are caused by different color spaces used by different devices and software. One solution is to use a system that can accurately interpret and convert colors between devices. The color management system (CMS) compares the created color space with the color space that will output the color and makes necessary adjustments to make the colors represented by different devices as consistent as possible.
The color management system converts colors by means of color profiles. The configuration file is a mathematical description of the color space of the device.
What is color correction?
Because the output of the printing plate is faithful to the document, that is, what color value is originally output, what color value is the color, so the color produced by the printed matter or digital proof cannot meet the needs of the customer, which requires the color to be corrected when the front end is produced.
Don't confuse color management with color correction. The color management system does not correct images with hue and color balance problems during storage. It provides an environment that can reliably evaluate images based on the final output.
Understand the above concept, then you can no longer do useless work, like the same single job, before using film plate printing, now use CTP plate printing, the color of the CTP work piece is in the dark part and the bright part and the film printing has The big difference is because CTP outlets can reach 1-99%, while film outlets below 3% are more difficult to expose.
Regarding color inaccuracy, you can't adjust the printing plate curve and digital proofing curve to adapt to the color of individual prints. You should master the quality control of the printing machine as soon as possible.
The colors printed by the CTP version are not accurate. There are also the following reasons. Since the printer master has just started using the CTP version, he is not completely familiar with the details of the CTP version, and the factors of piece counting exist. No longer adjust the ink, there are some printing products and original film printing color matching, printing and quick printing color matching, customers are instructing the color calibration. If it is the customer who corrects the color on the spot in the printing workshop, it is really no use. The standard of each customer is different, and color adjustment on the printing machine can only be achieved by increasing the ink or reducing the ink. , It is difficult to know how many dots can be printed in what color.
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