People often say that seven-point plate, three-point printing, in the process of plate making clever use of some skills to print often can play a finishing touch. Therefore, if you want to become an excellent designer and plate maker, you must be very familiar with the entire process of printing, in order to produce a plate that meets the requirements of various original copies, and finally achieve the fidelity of the printing to the original copies.

Indent technology refers to the two color or multi-color superimposed graphics, in the plate making according to the actual situation of some graphics in accordance with the color separation order of the superimposed before the plate on the basis of the original size slightly indent, in order to facilitate the printing of accurate overprinting, so that the graphics more realistic. For example, the "China Environmental Protection" mark on various packaging items on the market at present is overprinted by blue, yellow and gold.

In addition, many of the text on the packaging is also made of multi-color overprint. According to common sense, text separation overprinting is not recommended. According to the data, the image overprinting error in color printing is below 0.3mm, and the human eye does not feel obvious. When the text overprint error is about 0.1mm, the human eye is easy to detect. However, in some cases, in order to highlight a certain artistic effect of the text, it is necessary to use color separation overprinting, and indent technology can be used in plate making to reduce the difficulty of printing.

2. Bleeding technology

Bleeding technology refers to in order to ensure the stability of the original design size of the post-press processing, in the color separation plate, according to the actual situation, some color plates in the original design size to expand a certain proportion. Modern packaging is not only through a single printing, from the printed product to the finished product but also through many processes, such as: composite and bag-making in flexible packaging, paper packaging in the glazing, laminating and die-cutting. These processes may lead to a large error between the design size and the actual size. Therefore, it is necessary to apply bleeding technology reasonably according to different designs. For example, the main color of many flexible packaging is the full plate field, in order to ensure the stability of the basic size in the composite, cutting and bag-making process, the main color plate is expanded outward 1.5 ~ 3mm during electric carving, so as to ensure that the finished product meets the requirements.