As we all know, it is impossible to completely avoid the color difference for photo book printing. The key is how to control the color difference within a reasonable range. The first step to control the color consistency of products photo book printing is to establish a perfect color management system, so that operators can understand the standard of qualified products, including the following two points.

1. Determine the upper and lower limit of product color with customers

When a product is produced for the first time, the upper and lower limit of the standard color of the product shall be made, and the standard sample sheet shall be determined after the sample is sealed by the customer. In future production, the standard color of the standard sample sheet (or the first batch of product sample sheet) is taken as the basis, and the fluctuation of color shall not exceed the upper and lower limit of the standard. That is to say, confirm the range of color difference standard with customers in advance, ensure the color consistency of products, and give the production personnel a reasonable range of color fluctuation, so as to make the product color standard more operable. We must not simply catch up with the batch samples in each production, which will lead to the more batches of printing, the more serious the color difference of the products, and the difference is a hundred miles. In addition, it must be noted that the "standard sample sheet" sealed by customers should be replaced regularly, so as to avoid the deviation between the standard sample sheet and the actual printed product due to a long time.

2. Improve the system of signature and inspection of first and last parts

If you want to further ensure the implementation of color standards, the inspection items of product color should be included in the "product first and last parts inspection system" and "inspection quality record", so as to facilitate the workshop management personnel to control the color difference of products, and the unsuitable products will not be passed. At the same time, the managers and operators of the workshop should strengthen the inspection and sampling inspection to ensure that the products beyond the reasonable range of color difference can be found and handled in time in the production process. With the development of printing detection technology, the accuracy of color difference detection equipment has been greatly improved. If conditions permit, printing enterprises can introduce relevant color difference control equipment to realize digital color difference management.

Equipped with printing standard light source

Some printing enterprises do not use printing standard light source, which brings hidden trouble to color consistency control of printing products. There is a big difference between the color of products seen under the lighting light source when working at night shift and the color of products seen under daylight when working on day shift, which easily leads to color difference of printing. Therefore, it is suggested that printing workshop must use printing standard light source for lighting, and standard light source box should be equipped if necessary.

Ensure the quality of printing ink

Printing enterprises sometimes encounter such a situation: after the printing products are placed at the customer's place for a period of time, the ink color gradually changes, but the same phenomenon does not occur in the previous batches of printed products. This situation is generally due to the use of expired ink. The shelf life of ordinary ink is usually one year, and it is easy to fade printing products when using expired ink. Therefore, in the use of ink must pay attention to the ink shelf life, adhere to the first in first out principle. In addition, in the printing production process, but also pay attention to the use of ink additives. If the ink additive is used excessively, the color of the ink may change after printing. Therefore, in the use of various ink additives, it is best to communicate with the ink supplier to determine the correct proportion of additives.