How to accurately see samples in the hottest analy

2022-08-16
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Analyze how to accurately see samples in printing

1 the intensity of light directly affects the judgment of the color of printed samples

the intensity of light not only affects the brightness of color, but also changes the appearance of color. At ordinary times, we observe a light receiving cylinder. The light facing side is bright, and the backlight side is dark. The combination of light and shade is the middle tone. The same object, under standard light source 1 When the jaw is clamped, it is the normal color. If the light gradually becomes stronger, its tone will also change to a bright hue. When the light increases to a certain extent, any color can turn white. The reflective point of black porcelain is also white, because the light at the reflective point is concentrated and strongly reflected. Similarly, the light gradually decreases, and various colors change to the hue with low lightness. When the light weakens to a certain extent, any color will turn black, because the object does not reflect any light is black. Table 1 shows the influence of light intensity on color. The sample viewing platform in the printing workshop must meet the requirements. Generally, the illumination is required to be about 100lx in order to correctly identify the color

2 there are differences between viewing samples under colored light and sunlight

in the actual production process, most of them work under the irradiation of power supply, and each light source has a certain color. It is said that there are more than 150 million tons of plastic waste in the ocean, which brings some difficulties to correctly judge the color of the original or product. When viewing the color under colored light, the color change is generally the same color becomes lighter and the complementary color becomes darker, for example, when viewing the color under red light, the red becomes lighter, the Yellow becomes orange, the green becomes dark, the green becomes dark, and the white becomes red. Viewing color under green light, green becomes lighter, green becomes lighter, yellow becomes green, red becomes black, and white becomes green. Looking at the color under yellow light, yellow turns pale, magenta 1 turns into negative difference, red, green, blue, black, white and yellow. Viewing color under blue light, blue becomes lighter, blue becomes lighter, green becomes darker, yellow becomes black, white becomes blue. In the printing workshop, the fluorescent lamp with high color temperature (3500~4100k) and good color rendering coefficient is generally selected as the sample viewing light source, but it should be noted that the fluorescent lamp is slightly blue and purple according to different configuration parameters

3 the results will be slightly different if you look at the sample first and then the print and then the sample

you will feel different when you look at one color twice. This phenomenon is called sequential color contrast reaction. Why is there a sequential color contrast reaction? This is because the color you look at first excites the color nerve fibers of that color, and then look at other colors immediately. Other color nerves are soon excited to cause color sensation, while the color nerves that look at color first are in an excited and then inhibited state, and then excited slowly, causing a negative hue reaction. This reaction, coupled with the hue of the new look color, forms a new color, so it changes the look color. And the hue of the change is still regular, which is to change the complementary color of the first look color

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