The bag printing machine operator's summarized experience in proofreading colors against samples, the printing effect is very stunning

Because there are so many factors affecting the printing effect of packaging bags, printing proofing has become the most common method used in the printing process to check and control printing quality.

Whether it is monochrome printing or color printing, operators must frequently use their own eyes to repeatedly compare the printed matter with the sample, in order to find the difference between the printed matter and the sample, make timely corrections, and ensure the quality of the printed products.

Shunxingyuan Packaging, a professional flexible packaging manufacturer, has specially compiled how our printing masters proof and match colors, thus explaining why the packaging bags printed by Shunxingyuan are so stunning.

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

The intensity of light not only affects the brightness and darkness of the color, but also changes the appearance of the color.

When we observe a light-receiving cylinder, the illuminated side is the highlight, and the shaded side is the shadow. The combination of light and shadow is the midtone.

Under a standard light source, the same object is a true color. If the light gradually becomes stronger, its hue will also change to a brighter hue. When the brightness increases to a certain extent, any color can become white. The reflective point of a black porcelain is also white, because the light is concentrated at the reflective point and reflects strongly.

Similarly, as the light gradually decreases, various colors change to hues with lower brightness. When the light weakens to a certain extent, any color will become black, because the object does not reflect any light, it is black.

The illuminance of the proofing table in Shunxingyuan's printing workshop reaches about 100LX, so that the color can be correctly identified.

2、 There is a difference between proofing under colored light and proofing under sunlight.

In actual production, most of the work is done under the illumination of a power source, and each light source has a certain color. This brings certain difficulties to the correct judgment of the original or product color.

When observing colors under colored light, the color changes are generally that the same color becomes lighter, and the complementary color becomes darker, for example:

When observing colors under red light, red becomes lighter, yellow becomes orange, green becomes darker, cyan becomes darker, and white becomes red.

When observing colors under green light, green becomes lighter, cyan becomes lighter, yellow becomes yellowish green, red becomes black, and white becomes green.

When observing colors under yellow light, yellow becomes lighter, magenta becomes red, cyan becomes green, blue becomes black, and white becomes yellow.

When observing colors under blue light, blue becomes lighter, cyan becomes lighter, green becomes darker, yellow becomes black, and white becomes blue.

Shunxingyuan's printing workshop chooses fluorescent lamps with higher color temperature (3500~4100k) and better color rendering index as the proofing light source, and also pays attention to the problem that fluorescent lamps are slightly bluish-purple.

3、 The results will be slightly different whether you look at the sample first and then the printed matter, or look at the printed matter first and then the sample.

The feeling is different when looking at a color twice. This phenomenon is called the successive color contrast reaction.

Why does the successive color contrast reaction occur?

This is because the color seen first excites the color nerve fibers of that color. When another color is immediately seen, other color nerves are quickly excited, causing a color sensation, while the color nerves of the color seen first are in an inhibited state after excitation, and the excitation is slower, causing a negative color phase reaction.

This reaction, combined with the hue of the newly seen color, forms a new color, so it changes the color seen later. Moreover, the changed hue is also regular, changing towards the complementary color of the color seen first.

Understanding the above three aspects and their changing rules, you can understand why the packaging bags printed by Shunxingyuan are so stunning. We have many experienced printing masters, which effectively ensures the stability and continuous improvement of the quality of printed products.

The change trend of the color that the eyes focus on first, then the color that is focused on next:

Red Yellow Green Blue Purple White

Reddish Brown Greenish Yellow Fresh Green Cyan Blue Slightly Green

Yellow Purplish Red Grayish Yellow Greenish Blue Fresh Blue Blue Purple Slightly Purple

Green Fresh Red Orange Grayish Green Purple Reddish Purple Magenta

Blue Orange Golden Yellow Yellowish Green Grayish Blue Reddish Purple Light Orange

Purple Orange Lemon Yellow Yellowish Green Cyan Blue Grayish Purple Yellowish Green