Some requirements to pay attention to when printing sample!
Time:2022-11-23
Views:3183
1. The strength of light directly affects the judgment of the color of the printing proofs. The strength of light not only affects the brightness and shade of the color, but also changes the appearance of the color.
When we look at a illuminated cylinder, the side facing the light is bright and the side backlit is dark. The junction of light and dark is the middle tone.
The same object, under the standard light source is a positive color, if the light gradually becomes stronger, its hue will also change to a bright hue, light enhancement to a certain extent, any color can become white. The point of reflection on black porcelain is also white, because the point of reflection is concentrated and strongly reflected.
Similarly, the light gradually decreases, the various colors to the lower brightness of the hue change, light weakened to a certain extent, any color will become black, because the object does not reflect any light is black.
The sample reading table in the printing workshop must meet the requirements. The general requirement is that the illumination reaches about 100lx in order to correctly identify the color.
2. Color light under the sample and the sunlight is different in the production practice, most of the work is under the irradiation of the power source, and each light source has a certain color.
This brings certain difficulties to the correct judgment of the color of the manuscript or product. When viewing the color under the color light, the color change is generally the same color becomes lighter and the complementary color becomes darker.
3. First look at the proof and then look at the printing and printing and then look at the proof, the result will be slightly different, two times to see a color feel different.
This brings certain difficulties to the correct judgment of the color of the manuscript or product. When viewing the color under the color light, the color change is generally the same color becomes lighter and the complementary color becomes darker.
This phenomenon is called sequential color contrast.
Why does the sequential color contrast reaction occur? This is because the first color makes the color nerve fibers excited, and then look at other colors immediately. Other color nerves will be excited quickly to cause color perception, while the first color nerve is in a state of inhibition after excitement, and then excitement is slower, causing negative color reaction.
This reaction, combined with the hue of the new color, forms the new color, so you change the color. And the change of hue is still regular, is to see the first color of the complementary color changes.
To understand the above three aspects of the problem and master their change law, we should pay attention to the actual sample, so as to ensure the stability and improvement of the quality of printing products.
Printed matter is divided into monochrome printing and color printing. Monochrome printing is a type of printing limited to one color. Color printing can print full color pictures. Color printing mostly adopts color separation plate to reflect a variety of colors. Color separation plate is composed of red (M), yellow (Y), blue (C) and black (K) four-color network cable plate.
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