The printing process of gravure products, color plastic packaging products, in the final analysis is the process of color reproduction, and the most fundamental is whether the image processing technology of the plate making company is excellent, whether it can transfer customer satisfaction or exceed the customers' expectation of image color. Because customers first look at whether the color of the image is good or not, and the color is not bright; compared with the original manuscript, the color is not alike; it is not consistent with the color of his mind, and it will tell whether the quality of the plate making is good or bad. At the same time in the packaging art, often have "far near or flower color, look after flowers color, seven color three flowers", which fully shows that the processing of plastic packaging products, the color is so important. Therefore, the guiding ideology and the proposed method is: according to the guidance of plastic packaging printing color theory, give full play to the limit and method of printing color requirements meet people's psychological point of view, combined with the characteristics of color packaging products, in accordance with the principle of color configuration, color printing processing according to the law. Overcoming the current many operators just look at the screen color random, blind color adjustment, sometimes the lemon color orange color, resulting in a time rework. Therefore, it is important to master the ten methods and essentials of color processing.

(1) processing of color saturation

How to match saturation is an important part of color processing, because customers require their products to be saturated with bright colors, sometimes demanding harsh conditions. In fact, treatment can be based in various colors or equivalent compression loss of a part of color, strengthen the other part of the color, sometimes make all the saturation of the color balance should be preferential treatment according to the original content and main color, and master the following essentials:

Deep basic color

All kinds of field colors, such as red, green, blue and other field words, logo and other basic colors, do not need to be deep enough. The general customers need thick, bright and colorful logo. Therefore, the 100% is to do the 100% field, in order to give full play to the maximum limit of gravure ink solid density, can make 90% or 95% even, although 90% and 95% outlets after printing expanded by 100%, but the 100% generation and printing field effect is not the same, 90% of the net point density reached only in the field of region 90% outlets, and 5% or 10% regions expand despite ink, but the ink is thin, the density is not up to the field density effect, so from the visual point of view, the field density of 90% or 95% to 100% of the dot ink density is not the 100% kind of thick, bright.

Keep the level in the depth of the basic color

The point order range of the 1. depth basic color is 65%-90%, and more than 80% is the area with the largest enlargement of the gravure printing dot, which is easy to cause the level and level.

2. for this area need basic color level, should be emphasized in the field of color saturation under the premise of foot, keep the basic level in the depth of color, not emphasize the field density and the degree of foot caused by drinking, and the depth of color in the basic level, also pay attention to the depth of color in the level can not affect the lack of drinking and degree. To deal with the main points, the basic color of the depth of the needs should be reduced and the distance from the density of the field is opened to achieve the best effect.

Need to pay attention to the best configuration of RGB saturation. According to the characteristics of gravure printing, the best saturation of red, green and blue is configured as red =M95%+Y80%, green =Y95%+C80% and blue =C90%+M75%.