In the three-color system, the three primary color stimuli required to achieve color matching with the light to be measuredThe amount of excitement.
Use X (red primary color stimulation amount), Y (green Primary color stimulation amount) and Z (blue primary color stimulation amount).
According to Yang-Helmholtz’s three primary color theory, color The feeling is due to the combined result of three primary colors of light stimulation. In the three primary color system of red, green and blue, red. The stimulation amounts of green and blue are represented by R, G and B respectively. Since the three primary colors of red, green, and blue selected from the actual spectrum cannot match (match) all the colors that exist in nature, CIE theoretically hypothesized in 1931 that three primary colors that do not exist in nature , that is, the three theoretical primary colors, represented by X, Y, Z, in order to theoretically adjust (match) all colors. The XYZ color measurement system was formed. The X primary color is equivalent to red-violet with a higher saturation than spectral red, the Y primary color is equivalent to a green with a higher saturation than spectral green of 520 nm, and the Z primary color is equivalent to a saturation higher than spectral blue of 477 nm. High blue. The stimulation amounts of these three theoretical primary colors are represented by X, Y, Z, which are the so-called tristimulus values.
Although the two color “standard samples” and “comparison samples” may be consistent under a specific light source, they become inconsistent under other light sources. This is called color change. The two colors are called “color change pairs”. The reasons and explanations are:
The physical explanation is that there is a pair of colors with different spectra but the same under a certain light source. This pair of colors is called “metamerism””Of course, it will be different if you switch to other light sources. To explain further, under a specific light source (we call it the first light source), the triexcitation values of the standard sample and the comparison sample are adjusted to the same, so the two colors look the same, but under In addition, under the light source (we call it the second light source) the triexcitation values of the standard sample and the comparison sample are not necessarily the same. The reason for this is that the third The intensity of each wavelength of the second light source, from 400 μm to 750 μm in the wavelength spectrum, is inconsistent with the original first light source. Therefore, the intensity reflected by the color sample is different. Different intensities lead to different triexcitation values. The color combination created by the brain is not as consistent as the first light source.
The dye structure is basically divided into three parts: “chromogenic root group”, “reaction (binding) root group” and “connection root group”
Chromophoric root group: You can irradiate light (photons) onto this chemical structure (photons hit the chromophoric root group, generate resonance and emit a specific wavelength). The feeling of color.
Reaction (binding) root mass: It can react with fibers to fix the dye. This is called the reaction mass of the dye. Various fibers are different, and the reaction binding mass is different, such as cotton, or nylon/or nylon. There are different reaction groups in the fiber dye.
Connecting root group: It is between the chromogenic root group and the reaction root group to bridge and connect the chromogenic root group and the reaction root group in series, so that the chromogenic root group and the reaction root group become one.
Lamp jump is also called metamerism. The solution is to choose a color block with a color close to the standard sample. The color prescriptions used are different dyes, so that they are measured with the standard sample under a color measuring and matching instrument. Color, choose a color formula with a smaller jump light
The color jump phenomenon is a problem in every dyeing factory and is an inevitable problem. The main reason is that the dyes used in the original and production samples are different. In different dyeing factories, the dyes are different. Each dyeing factory , and it is unlikely that there are multiple brands of dyes, so realistically speaking, it is a bit difficult to solve this problem.
Under such circumstances, it is very important to confirm the color sample before producing large quantities of goods. Sometimes, we are always a little careless in our hearts, especially when the delivery time is relatively urgent, we feel that we should put the previous products first. It doesn’t matter if the processing is done and the color is confirmed, but sometimes the color is not confirmed, which is very troublesome.
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