How to treat the difference between the sample and the finished product
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The most common method used to check print quality during printing operations when printing. Whether it is monochrome printing or color printing, operators must often use their own eyes to repeatedly compare the printed products with the proofs to find out the difference between the printed products and the proofs, and correct them in time to ensure the quality of the printed products. The following questions are worthy of our attention when printing:
One: the strength 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.
Usually we observe a cylinder that receives light, the side of the light is bright, and the surface of the backlight is dark. The combination of light and dark is a middle note.
The same object is a positive color under the standard light source. If the light gradually becomes stronger, its color tone will also change to a bright hue, and the brightness will be enhanced to a certain extent, and any color can be changed to white. The black porcelain has a reflective point that is also white, because the light at the point of reflection is concentrated and strongly reflected. In the same way, the light gradually decreases, and the various colors change to a low-light shade. When the light is weakened to a certain extent, any color will turn black, because the object does not reflect any light or black. Table 1 shows the effect of light intensity on color.
The sample shop in the printing workshop must meet the requirements. Generally, the illumination should reach about 100LX to correctly recognize the color.
Two: there is a difference between the color light and the daylight.
In production practice, most of them work under the illumination of a power source, and each light source has a certain color. This will bring certain difficulties to correctly judge the original or product color. Under the color light, the color change is generally the same color becomes lighter, the complementary color becomes darker, for example: under the red light, the red is light, the yellow is orange, the green is changed. Dark, green becomes dark, white turns red.
Under the green light, the color changes, the green becomes lighter, the green becomes lighter, the yellow turns greenish yellow, the red turns black, and the white turns green.
Under the yellow light, the color changes, the yellow becomes light, the magenta turns red, the green turns green, the blue turns black, and the white turns yellow.
Under blue light, the color becomes blue, the blue becomes lighter, the green becomes lighter, the green becomes darker, the yellow becomes black, and the white turns blue.
In the printing workshop, fluorescent lamps with a higher color temperature (3500~4100K) and a better color rendering coefficient are generally selected as the light source for viewing, but it should be noted that the fluorescent lamps are slightly blue-violet. How to treat the difference between the sample and the finished product
Three: look at the sample and then look at the printed products and look at the printed products first and then see the proofs, the results will be slightly different
It feels different when you look at one color twice. This phenomenon is called sequential color contrast reaction, and the change is shown in Table 2.
Why are there successive color contrast reactions? This is because the color of the first look makes the color nerve fibers of the color excited, and immediately look at other colors. Other color nerves are excited to cause color sense, and the color nerves that look at the color are in a state of inhibition after excitement, and then excited. Slower, causing a negative hue reaction. This reaction adds a new color to the hue, forming a new color, so change the color and look at it. Moreover, the changed hue is still regular, and it is a change in the complementary color of the color.
Understand the above three aspects of the problem and understand their changes, we should pay attention to the actual look, in order to ensure the stability and improvement of the quality of printed products.
The color of the eye first looks at the color and then the color of the eye
Red yellow green blue purple white
Red clay, red, green, yellow, green, green, blue, green
Yellow-purple red, gray, yellow, green, blue, purple, purple
Green fresh red orange gray green purple red magenta
Blue Orange Golden Yellow Green Gray Blue Red Purple Orange
Purple Orange Lemon Yellow Yellow Green Blue Blue Gray Purple Green Yellow