In everyday life, we can feel that when viewing the same object in different light sources or environments, the colors of the objects presented in our eyes will be more or less biased. This is because different light sources have different radiant energy. When exposed to different objects, different colors appear.
A similar situation can also occur when a printing factory conducts color management. For example, even though quality inspectors have carefully compared the colors of the goods, when the goods are delivered to customers, they will also receive complaints from customers about the difference in the color of the goods. In serious cases, they may cause returns or receive compensation from customers. The company’s reputation is natural. Damaged.
To solve this problem effectively, the easiest way is to verify the color of the goods, must be carried out under the same light source and under controllable conditions, such as commonly used artificial fluorescent lamp CIE D65 (ie 6500K color temperature), otherwise all assessment is meaningless and Untrustworthy. The author serves as the customer service department of the quality inspection instrument manufacturer for the printing factory, and contacts the quality inspection department of the printing factory all the year round. The following discusses how to carry out the standard color matching and the requirements of the requirements:
First, the light source standard
1. Use the artificial fluorescent lamp D65 approved by the World Illumination Institute (CIE) as the illumination source. The fine color discrimination in industrial production requires that the illumination source has a true spectral distribution (including UV radiation and spectral radiation), and the D65 light source can be improved. Copy the true gaze.
2. The illuminance of the light source ranges from 750 to 3200 lux; the color rendering index is >90; the uniformity is >80%.
3. When performing color discrimination work, the background color requirements: Obvious color is a subjective feeling, so comparing colors in different backgrounds can also produce different results. Therefore, all background colors are defined as Neutral Gray with a Munsell value of 6-8.
4. The requirements of the environmental factors in color discrimination: All the lights will have the opportunity to be exposed outside the tester. Lights should be avoided as much as possible. If the window is in the field of view, grey curtains should be installed to cover it. Therefore, use a light source box in the black room. It is ideal.
5. Record the time used by the standard lamp: All standard light sources are also generated by the lamp, and the manufacturer will also list its products to operate for a certain period of time. Therefore, an accurate time recorder is indispensable. Usually these lamps have to be replaced if they are used for some time.
6. Lamp arrangement: Obviously there is no specific requirement for the arrangement of the lamps, but the arrangement of the lamps must have a uniform light source in the light box, and must not be placed on a certain area.
Second, the correct use of standard light sources
1. Observation angle
The above points are all necessary facilities for standard light sources, but the observation angle will also directly affect the assessment results. According to international standards, only two observation angles can use them:
1 Zero degree light source, 45 degree observation (0°/45°), that is, the light source is irradiated from the zero degree (vertical) incident angle on the sample, and the observer observes the sample from 45 degrees.
245 degree light source, zero degree observation (45°/0°)
3 Use a 45°Fixed Angfe Table in this layout so that the light source shines on the sample from 45 degrees. The observer observes the sample from zero (vertical).
2. Print position
Regardless of the use of any of the above observation methods, it must be noted that the printed matter should be placed in the middle of the light source as much as possible to reduce the influence of the external light source. In addition, when it is necessary to compare the colors of two or more objects, try not to overlap them and watch them. It is better to discharge them flat in the light source.
A similar situation can also occur when a printing factory conducts color management. For example, even though quality inspectors have carefully compared the colors of the goods, when the goods are delivered to customers, they will also receive complaints from customers about the difference in the color of the goods. In serious cases, they may cause returns or receive compensation from customers. The company’s reputation is natural. Damaged.
To solve this problem effectively, the easiest way is to verify the color of the goods, must be carried out under the same light source and under controllable conditions, such as commonly used artificial fluorescent lamp CIE D65 (ie 6500K color temperature), otherwise all assessment is meaningless and Untrustworthy. The author serves as the customer service department of the quality inspection instrument manufacturer for the printing factory, and contacts the quality inspection department of the printing factory all the year round. The following discusses how to carry out the standard color matching and the requirements of the requirements:
First, the light source standard
1. Use the artificial fluorescent lamp D65 approved by the World Illumination Institute (CIE) as the illumination source. The fine color discrimination in industrial production requires that the illumination source has a true spectral distribution (including UV radiation and spectral radiation), and the D65 light source can be improved. Copy the true gaze.
2. The illuminance of the light source ranges from 750 to 3200 lux; the color rendering index is >90; the uniformity is >80%.
3. When performing color discrimination work, the background color requirements: Obvious color is a subjective feeling, so comparing colors in different backgrounds can also produce different results. Therefore, all background colors are defined as Neutral Gray with a Munsell value of 6-8.
4. The requirements of the environmental factors in color discrimination: All the lights will have the opportunity to be exposed outside the tester. Lights should be avoided as much as possible. If the window is in the field of view, grey curtains should be installed to cover it. Therefore, use a light source box in the black room. It is ideal.
5. Record the time used by the standard lamp: All standard light sources are also generated by the lamp, and the manufacturer will also list its products to operate for a certain period of time. Therefore, an accurate time recorder is indispensable. Usually these lamps have to be replaced if they are used for some time.
6. Lamp arrangement: Obviously there is no specific requirement for the arrangement of the lamps, but the arrangement of the lamps must have a uniform light source in the light box, and must not be placed on a certain area.
Second, the correct use of standard light sources
1. Observation angle
The above points are all necessary facilities for standard light sources, but the observation angle will also directly affect the assessment results. According to international standards, only two observation angles can use them:
1 Zero degree light source, 45 degree observation (0°/45°), that is, the light source is irradiated from the zero degree (vertical) incident angle on the sample, and the observer observes the sample from 45 degrees.
245 degree light source, zero degree observation (45°/0°)
3 Use a 45°Fixed Angfe Table in this layout so that the light source shines on the sample from 45 degrees. The observer observes the sample from zero (vertical).
2. Print position
Regardless of the use of any of the above observation methods, it must be noted that the printed matter should be placed in the middle of the light source as much as possible to reduce the influence of the external light source. In addition, when it is necessary to compare the colors of two or more objects, try not to overlap them and watch them. It is better to discharge them flat in the light source.
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