In card game printing wholesale, the purpose of printing samples is generally to check the printing quality during the printing operation. Whether it is monochrome printing or color printing, the operator must often use his eyes to repeatedly compare the print with the proof to find out the difference between the print and the proof, and correct it in time to ensure the quality of the printed product. So in the actual work should be how to identify printing color sample?

First, the order of looking at proofs and prints will affect the results

When you look at a color twice, it feels a little different, a phenomenon called sequential color contrast reaction. Why does the sequential color contrast reaction occur? This is because the first color makes the color nerve fibers excited, immediately look at other colors, other color nerves excited quickly cause color sense, and the first color nerve is in a state of inhibition after excitement, and then the excitement is slower, causing a negative color response. This reaction is combined with the hue of the new look color to form a new color, so it changes the back look color. And the changed hue is still regular, is to look at the first color of the complementary color changes.

Second, the strength of the light directly affects the judgment of the color of the printed proof

The intensity of the light not only has an effect on the brightness and shade of the color, but also changes the appearance of the color. The brightness of the printing workshop sample table must meet the requirements, and the general requirement is that the illumination reaches about 100LX in order to correctly identify the color.

Third, there is a difference between looking at samples under color light and daylight

In production practice, most work under the irradiation of the power supply, and each light source has a certain color. This has brought certain difficulties to the correct judgment of the original manuscript or product color, color viewing under the color light, color changes are generally the same color becomes lighter, complementary colors become darker. In the printing workshop, the color temperature is generally higher (3500~4100K), and the color rendering coefficient is better than the fluorescent lamp as a sample light source, but it should be noted that the fluorescent lamp is slightly blue and purple.

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