Each person's perception and interpretation of color is very subjective and varies from person to person for a variety of reasons, including personal preference, age, eye fatigue, and other physiological factors such as nearsightedness and farsightedness.
There are various kinds of test instruments needed for measuring various colors in various industries. First, let's talk about colorimeter .
All common colors can be formed by "mixing" the three primary colors - red, green, and blue - in different proportion. In order to facilitate the measurement of colors, physicists introduced the tri-stimulus value. According to chromatic theory, any color of colored light can be represented by the tri-stimulus value. A general colorimeter works by measuring the three stimulus values of the reflected light from the collected sample and determining the color difference between the target sample and the sample to be measured. The other one is the spectrophotometer, which is designed according to the spectrophotometer principle and can measure the reflectance curve at each wavelength, as well as to measure the L, a, and b values accurately, which is more accurate and stable than the general chromatic aberrometer.
Secondly, it is the whiteness meter. Whiteness is defined as the degree of whiteness that characterizes the color of an object; the higher the value of whiteness, the greater the degree of whiteness measured. The whiteness meter uses an integrating sphere to achieve absolute spectral diffuse reflectance measurements. The whiteness meter is applied to measure the whiteness of blue light on the surface of an object, which is suitable for textiles, printing and dyeing, chemical fibers, plastics, porcelain clay, talcum powder, white cement, coatings, paints, ceramics, enamel, paper, pulp and other departments that need to determine the whiteness of products.
Thirdly, it is the densitometer. The densitometer utilizes built-in red, green, and blue optical filters to measure the light reflection or transmittance of yellow, magenta, and cyan colors and calculates the density value. Densitometers are currently used primarily in the board industry and for all types of printing to help implement comprehensive color control from pre-press to the shop floor.
In summary, although all three types of color measurement instruments can be used for color quality control, there are significant differences. The measured values are different depending on the industry in which they are used. The colorimeter is suitable for measuring the color difference in almost all fields, mainly measuring the sample-to-sample color difference, but also for measuring whiteness values, such as CIE whiteness, Hunter whiteness. Whiteness meters are mainly used to measure the whiteness of surfaces and have a narrower range of application than colorimeter. The densitometer can only measure the density value of printed materials, but not the expression of the hue, which does not reflect the actual visual effect of color and has limited application areas.
The applications of colorimeter are relatively comprehensive. Rayclouds is a high-tech enterprise focusing on optics, color, and other optoelectronic testing technology, and independently develops and produces colorimeter and spectrophotometer, which is the high-quality choice for colorimeter and spectrophotometer.