How to avoid color distortion in the printing of colorful packaging bags?

Many color management systems have been developed in the flexible packaging industry, and there is a certain degree of control over the colors printed on colorful packaging bags. In order to better serve customers, Shunxingyuan Packaging, a professional flexible packaging manufacturer, has specially compiled its printing experience in the hope of helping enterprises with the need to order colorful packaging bags find reliable packaging bag suppliers.

I. Main factors causing color distortion

1. Color distortion caused by color reproduction processing

Modern printing usually uses C, M, Y, K four-color inks to reproduce colors. Due to the purity problems of the inks themselves, color distortion will also occur during printing overprinting.

2. Color distortion caused by color separation processing

Printing usually uses C, M, Y, K four-color inks to reproduce colors, while the image information collected by digital acquisition equipment into the computer is usually R, G, B information. Therefore, before printing plate making, the image information needs to be converted into C, M, Y, K mode, that is, color separation processing. "Color separation" refers to decomposing the color information of each pixel of the image (generally R, G, B color information) into color information suitable for printing C, M, Y, K mode.

Color information loss will occur during the color separation process. During color separation, only by correctly setting the color separation parameters according to the printability of ink, paper, etc. (such as setting dot gain, gray balance parameters, black plate gradation, etc.), it is possible to output high-quality color separation films and minimize color information loss.

3. Color distortion in the original

Most of the printing image originals are obtained through photographic means. For photographic originals, in addition to color distortion caused by improper operation during shooting, because color is reproduced by colorants and other color-rendering materials, and color-rendering materials are prone to color fading, it may also cause color distortion in photos.

In addition, with the increasing popularity of digital cameras, digital image originals are increasing, and the technical requirements for operators of digital cameras are greatly improved. Due to the poor technical level of operators, the images taken are prone to problems such as dark images and blurred images, causing color distortion in the originals.

4. Color distortion caused by scanning processing

The image density of photographic originals is continuous, and the image information needs to be collected into the computer. When using a scanning device to scan an image, the image needs to be divided into discontinuous pixels, and the R, G, B information of each pixel on the original is collected point by point and line by line. R, G, B information.

During the scanning process, pixel color information will be lost, and image processing is based on the collected image information, and all color operations are performed on this basis, and cannot increase the color information of the image. Therefore, for photographic originals, scanning is a very crucial link in image processing, and improper operation will cause image color distortion.

II. How to identify color distortion

1. First impression benchmark method

The human eye has a certain adaptability to color. For images with slight color distortion, repeated observation will weaken the ability to identify. Therefore, when judging whether there is color distortion, using the first impression to eliminate the limitations of human eye color vision is an important method to find color distortion.

2. Neutral color benchmark method

There are many neutral colors in life, such as black, white, and gray. They are the zero points of colors in the colorful world, and we can use them as the basis for identifying color distortion.

3. Skin color benchmark method

Skin color is the most familiar color to people. For any image of a person, especially a picture with a portrait as the main subject, the skin color can be used as the basis for identifying color distortion. Whether it is yellow skin, white skin or black skin, its skin color has a rule, that is, it is blood color.

That is: red in yellow, red in white, or red in black. If the skin color of the person in the image is yellowish, it will give people a sickly feeling. Under normal circumstances, even if the skin color of the person in the image is really yellowish, it should be adjusted to blood color during color correction, that is, red in yellow.

In the printing operation of colorful packaging bags, Shunxingyuan Packaging can skillfully master the main factors and identification methods of distortion, thereby ensuring the production of high-quality packaging bags and successfully achieving the complete effect in the minds of customers.