In daily life, we can also feel that when viewing the same object in different light sources or environments, the color of the object presented in our eyes will be more or less biased. This is because different light sources have different spectral characteristics, and different colors will appear when irradiating the same object. Similar situations may occur in the color management of printing plants. For example, although the quality inspector has carefully compared the colors of products, when the products are delivered to customers, they will also receive complaints from customers about the color differences of products. In serious cases, they may lead to return of products or be claimed by customers, which will naturally affect the company's reputation. To effectively solve this problem, the simplest way is to test the color of the product under the same light source and controllable conditions, such as cied65 (6500k color temperature), otherwise, all evaluation is meaningless. To achieve this, there is no better than to use the most commonly used standard color light source. As the customer service personnel for the printing factory providing quality testing instruments, I have been in contact with the quality inspection department of the printing factory all the year round. The following is a discussion on how to carry out standard color matching and the required conditions. Light source standard 1. Using fluorescent lamp D65 in industrial production requires that the lighting source has real solar spectrum distribution (including ultraviolet radiation and spectral radiation), and fluorescent lamp D65 approved by CIE can perfectly imitate real sunlight. 2. The illuminance range of the light source is 750-3200 lux, the color rendering index is more than 90, and the uniformity is more than 80%. 3. The requirement of the background color is obvious. The color is a subjective feeling, so comparing the color in different background can produce different results. Therefore, all background colors are defined as neutral grey with Munsell values of 6-8. 4. The requirements of environmental factors in color discrimination should try to block all possible external light on the detector. If the window is in the field of vision, gray curtain should also be installed, so color identification in darkroom is the most ideal. 5. Record the service time of standard lamp tubes. All standard light sources are acted by lamps. The lamp manufacturer will also list the operation time of their products within a certain period of time. Therefore, an accurate time recorder is needed. Usually these lamps must be replaced after they have been used for some time. 6. There is no specific requirement for the arrangement position of lamp tubes, but the arrangement position must have uniform light source in the lamp box, and must not be deviated from a certain area. The correct use of standard light source: 1. The observation angle above the observation angle is necessary for the standard light source, but the observation angle will directly affect the result of color discrimination. According to the international standard, only two viewing angles can be used: A. 0 ° light source, 45 ° observation (0 ° / 45 °), that is, the light source irradiates the printed matter with 0 ° incident angle (vertical), and the observer observes the printed matter at 45 ° angle. b. 45 ° light source, 0 ° observation (45 ° / 0 °) uses a specific 45 ° fixed angle table, so that the light source irradiates the printed matter at 45 ° angle, and the observer observes the printed matter at 0 ° viewing angle (vertical). 2. Position of printed matter no matter which observation method is used, the printed matter should be placed in the middle of the light source as far as possible to reduce the influence of external light source. The most important thing is that when you need to compare the colors of two or more objects, try not to overlap them, and it is best to view them in parallel under the light source.
Dongguan Beite packaging materials Co., Ltd. - located in Dongguan City, the world's manufacturing city, is a subsidiary of Beite packaging (China) Co., Ltd., with a plant area of 6000 square meters. It is a flexible packaging enterprise integrating R & D, production and sales. It has a complete set of domestic advanced production equipment, a scientific and humanized management system and a group of experienced technical personnel For backing, to provide customers with quality products and first-class service.
The company produces composite bags, roll film, fruit bags, aluminum foil bags, suction mouth bags, self-supporting bags, zipper bags, anti-static bags, special-shaped bags, etc., which are suitable for the internal and external packaging of food, daily chemicals, electronics, toys, medicine, cosmetics, industrial products and other industries.
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