1 Using color science to make chromatography for mobile back cover photo printing machine
Throughout the color reproduction process, it has undergone three processes of color analysis, color transfer and color combination. The correctness of color change control in each process is directly related to the final quality of the mobile back cover photo printing machine
, so a color standard, that is, chromatography of mobile back cover photo printing machine
, is required to regulate various hue in the process of the mobile back cover photo printing machine
Chromatography of mobile back cover photo printing machine
is the use of three primary colors of yellow, magenta, cyan and black, mixed in different proportions or dots and stacked to form a book of various color patterns for people to design, copy, ink Use for matching and other aspects.
At present, Pantone color-matching chromatography of American PANTONE is widely used in the world. However, the color of the mobile back cover photo printing machine
is represented by the color material. Its production is usually affected by many factors such as ink, paper, mobile phone shell printing machine process and equipment. Therefore, units of mobile back cover photo printing machine
should base on the raw materials, production process, equipment conditions, etc. to produced their own dedicated mobile phone shell printer.
2 Using color theory to measure color and color difference
The color measurement in the colorful mobile back cover photo printing machine
can be roughly divided into three types: contrast visual method, density measurement method and color measurement method.
In the process of mobile back cover photo printing machine
, the color is measured by contrast visual method, which is mainly based on the experience of the operator to evaluate the color of the original, the signal strip and the printed sheet by reference to the standard color ratio. Due to the influence of the observer's own physiological and psychological factors, the accuracy of the comparison visual method is relatively poor.
However, because the digital printing equipment
does not need to be equipped with fine measuring instruments, it is widely used in general copying work.
The chromaticity measurement method is based on the principle of colorimetry, taking the color of the important part of the image of the mobile back cover photo printing machine
as a monitoring point, directly measuring the tristimulus value of the color, and obtaining the color measurement method of the color chromaticity information. The method can accurately express the color difference of the standard proof and the sample to be tested and the required proximity, without additional check or control strip. However, it has not been promoted and popularized at present, mainly because the instrument is expensive and has high color theory requirements for users.