Welche Faktoren beeinflussen die Druckqualität?

In the process of commercial transactions, it is particularly important to evaluate the quality of printed matter. The complexity of the color printing process is well known. The production of a printed matter often takes more than ten steps to complete, which involves companies, staff, etc., in different environments and different times, the evaluation methods or requirements for printed matter are different. So in this process, some specifications and corresponding observation conditions need to be formulated.

Therefore, only by restricting the external factors of the environment, can we make a subjective evaluation of the printed matter, which can be called fair and objective, and can reduce disputes caused by the environment. Therefore, the standard lighting environment and standard light source are necessary. 

Color difference of printed matter

Color difference can be divided into (1) original color difference: reproducing the color gradation of the original is the purpose of printing and copying, and the highest standard of subjective evaluation is to make the printed matter and the original difficult to distinguish each other. (2) Same batch color difference: refers to the color error between different printed sheets of the same batch of products at the same position in the same hue zone. (3) Color difference between different batches of the same product: refers to the color error between different batches of the same product. If the colors printed in each batch are slightly different, when they are put together, customers will feel that these products are different from the old and the new, and even suspect whether its internal quality will be as unstable as its appearance, it will cause distrust of the product, and naturally cause the manufacturer to be dissatisfied with the quality of the printer's products.

Both customers and printers hope that there are no color difference. However, due to the limitations of various aspects in actual production, it is impossible to completely eliminate the color error. The only way to make the product is by strengthening the quality control of each link is to make  color quality difference is controlled within the specified color difference standard. Color tolerance refers to the color difference between the printed matter acceptable to the customer and the original or proof.

Subjective Evaluation

The subjective evaluation of the color quality of printed products is based on visual inspection. After the observer visually inspects the printed matter and compares it with the original or printed manuscript, he makes his own judgment. The main consideration is to what extent the color quality of the printed matter can be accepted by the customer.

Whether in the printing process or when checking the quality after printing, printing operators or quality inspectors should always rely on their own feeling and experience to evaluate the color quality of printed products based on the fidelity and authenticity of the reproduction as the standard.

The faithfulness of reproduction refers to the degree of reproduction of the color gradation of the manuscript by the printed matter. Printed matter is a kind of reproduction. In the entire color reproduction process from pre-printing  processing to printing, the original is the basis of our work. Reproducing the color gradation of the original is the purpose of printing and reproduction. It is the highest standard of subjective evaluation to make the printed matter and the original manuscript reach the degree of indistinguishable from each other.

When there is no manuscript for comparison, the color quality of the printed matter is related to the sense of reality, that is, it is required to match the memory color of most people. Most people have a preconceived habit of common objects. If the main color of the printed matter is different from the color of the real object, the printed matter cannot be called a high-quality reproduction. In short, the subjective evaluation criteria for the color quality of printed matter is to replicate authenticity, naturalness, and coordination. Of course, it sometimes changes slightly with the intention of the customer or the purpose of the product.

Definition of manuscript

In the past, most manuscripts came from photographic slides, photos, and hand-painted color manuscripts. In the process of color separation and proofing, if you can get close to the manuscript, it is regarded as effective color reproduction. For printing, the proofing approved by the customer is used as the criterion. As long as 90% can be followed, it is generally regarded as qualified.

But nowadays, there are more definition of manuscripts in the computer age. For example, when customers see satisfactory colors on the computer screen or printed manuscript, they think it is the manuscript. Regardless of any type of manuscript, the colors they record or appear may not necessarily be expressed under general printing conditions, because every color reproduction system has its color gamut restrictions. In the production process, the image capturer regards the actual object as the original manuscript, the color separation plate maker uses the photo taken as the original manuscript, and the printer uses the proofing as the goal of color tracking.

Objective evaluation

The objective evaluation of the color quality of printed matter is to calculate the result of the subjective evaluation by statistical means, and then convert it into the corresponding physical quantity, which is used as the objective evaluation standard. In this way, the influence of human factors in the evaluation can be eliminated, and the color quality of various printed materials can be fairly evaluated by standardized unified standards, and finally it can be more in line with the subjective evaluation standards of most people. The objective evaluation method mainly uses specific measuring instruments and tools, and measures some standard elements printed together with the printed image. Only through measurement can the automatic control of printing quality become possible to a certain extent.

Color quality and production control

In order to produce high-quality color prints, it is necessary to strengthen the quality control of the production process, and the quality control mainly depends on the objective evaluation criteria of the product, that is, a set of strict data specifications are formulated, and various instruments are used to objectively measure and Evaluate the color quality and other quality of printed matter.

The purpose of color control management is to improve the small gaps between manuscripts, proofs and products. In the printing process, if the printed matter can be spot-checked at any time, the problem can be found through the deviated information, the cause can be found in time, the problem can be corrected, and the reproduction quality of the printed matter can be guaranteed. In addition to using density as a parameter to reflect the color quality of printed matter, it is necessary to promote the CIELab chromaticity value of color as a parameter to detect the quality of printing.

Every link must be managed by data, and every step must be tested by testing tools, otherwise there will be many errors. Nowadays, with the continuous advancement of process technology, the color control methods in printing have also been further developed. The brand-new color management system makes printing color control convenient and more effective.

Xiamen Rise Dongsheng Import & Export Co., Ltd., a professional manufacturer of packaging enterprise, with more than 15 years experience，we can do OEM or ODM service, Our workshops mainly produce Paper box，packaging boxes，gift box，Jewelry box，cosmetic box，Cake box，Chocolate box，Wine box，Candle box，Corrugated Box，Paper  Bag，Shopping bag.More information about our company and inproductions ,please mail to sales1@huakangortho.com or enter our web Chris@risedongsheng.com