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Check print skills(Based on digital sample)

Time:2020-06-16 Views:48
Check print skills(Based on digital sample) 

The most common method used to check the print quality during the printing operation when printing samples. Whether it is monochrome printing or color printing, the operator must often use his own eyes to repeatedly compare the printed product with the sample to find the difference between the printed product and the sample, correct in time, and ensure the quality of the printed product. The following issues deserve our attention when printing samples.

1、The intensity of the light directly affects the judgment of the color of the printed sample

The intensity of light not only affects the brightness of the color, but also changes the appearance of the color. The sample table in the printing workshop must meet the requirements. Generally, the illuminance needs to reach about 100LX to correctly identify the color.

2、There is a difference between seeing a sample under shaded light and seeing a sample under daylight

In the actual production, most work under the illumination of the power supply, and each light source has a certain color. This brings certain difficulties to the correct judgment of the color of the original or product. When looking at the color, 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 used as the sample light source, but it should be noted that the fluorescent lamp is slightly blue and purple.

3、The results will be slightly different if you look at the sample first and then the printed product and the printed product and then the sample.

It feels different when I look at a color twice. This phenomenon is called successive color contrast reaction.

Why is there a color contrast reaction? This is because the first look at the color excites the colored nerve fibers of that color, and then immediately looks at other colors. The other colored nerves quickly excite and cause color perception, while the colored nerves that first look at the color are in a state of inhibition after excitement, and then excited Slower, causing a negative hue reaction. This reaction is combined with the hue of the new color to form a new color, so the color is changed after the change. And the hue of the change is still regular, it is to look at the complementary color of the color first.

Understand the problems in the above three aspects and understand their changing rules. We should pay attention when we actually look at the samples, so as to ensure the stability and improvement of the quality of printed products.
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