Print quality refers to the comprehensive effect of various appearance characteristics of printed matter. From the perspective of copying technology, print quality should be based on "faithful reproduction of the original". Whether in the traditional printing process or in the digital process, the printed matter must be faithfully copied to the original.
Print quality control elements
There are 4 control elements for printed matter: color, gradation, clarity, consistency.
Color is the foundation of product quality, which directly determines the quality of the product. Color control or management has always been a key link in the research and analysis of printing professionals.
That is, the tone refers to the change of the color gradation that can be recognized by the image. It is the basis for accurate color reproduction.
Clarity refers to the clarity of image details, including three aspects, the clarity of the subtle levels of the image, the clarity of the edges of the image outline, and the clarity of the image details.
Consistency is uniformity, which includes two aspects. On the one hand, it refers to the consistency of the ink volume of different parts of the same batch of printed matter, that is, different ink areas. It is generally measured by the consistency of the vertical and horizontal solid density of the printed matter. It reflects the stability of different parts of the printed matter printed at the same time. On the Other hand, it refers to the consistency of the density of different batches of printed products in the same location, which reflects the stability of the printing press.
For printed matter, as long as these four aspects are well controlled, that is, the color, gradation, clarity, and consistency of the printed matter can be well controlled, you can get high-quality printed matter.
Printing quality control method
One of the methods of printing quality control is to use conventional signal strips, test strips, control strips, ladders, and test instruments and charts to scientifically and quantitatively control the printing quality (including printing quality and printing engineering quality). At present, there are many types of signal strips and test strips used in various countries, such as the GATF system in the United States, the Brunner system in Switzerland, the Fogra system in Germany, and the Glinda system. In China, the signals and test strips of GATF and Brunner of Switzerland are mostly used.
Common testing tools for printing include signal strips, test strips, control strips, and ladders. The signal bar is mainly used for visual evaluation, the function is relatively single, and it can only express the appearance quality information of the printed matter. Such as the sun ladder, GATF code signal bar, color signal bar, etc. The test strip is a multi-functional marking element mainly based on density meter detection and evaluation. It is a test strip combining visual identification and density meter test, and numerically calculating with the help of charts and curves. The control bar is a multifunctional control tool that combines the visual evaluation and test evaluation of the signal bar and the test bar. Such as Brunel's third generation control strip. The ladders have unequal density or dots, which are used to control the printing and printing quality.
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