[Wo Gengtang burlap bag] How to see the print color?
[Wo Gengtang burlap bag ] How to see the print color?
A common method is to check the print quality during a printing operation. Regardless of whether it is monochrome or color printing, the operator must often use his own eyes to repeatedly compare the printed product with the proof, in order to find the difference between the printed product and the proof, and correct it in time to ensure the quality of Chengdu printed products.
A few questions when looking at the sample:
One: The intensity of light directly affects the judgment of the color of printed samples. The intensity of light not only affects the brightness of the color, but also changes the appearance of the color. The sample stand in the printing shop must meet the requirements. Generally, the illuminance must be about 100LX to correctly identify the color.
Two: There is a difference between seeing samples under colored light and seeing samples under sunlight. In production practice, most of them work under the irradiation of a power source, and each light source has a certain color. This makes it difficult to judge the color of the original or the product correctly. When viewing the color under colored light, the color change is generally the same color becomes lighter and the complementary color becomes darker. In the printing workshop, fluorescent lamps with high color temperature (3500 ~ 4100K) and good color rendering coefficient are generally selected as the sample light source, but it should be noted that fluorescent lamps are slightly blue-violet.
3: Look at the proof first and then the print and see the print first and then the proof, the result will be slightly different
When looking at one color twice, it feels a little different. This phenomenon is called successive color contrast response. Why is there a sequential color contrast reaction? This is because the color that is seen first excites the color nerve fibers of that color, and then looks at other colors immediately. The other color nerves quickly excite the color sense, and the color nerve that looks first It is in a state of inhibition after excitement and slower excitement again, causing a negative hue response. This reaction adds the hue of the new look to form a new color, so the back look color is changed. And the changing hue is still regular, it is to change the complementary color of the color first.
Knowing the above three questions, I don't know if I have realized some matters when actually looking at the samples, but the printer chief has more than 10 years of rich printing experience, and also recognizes the above method of identifying the printing color samples, as far as possible Stability and improvement of printing product quality.