Colorimeter for color control process to detect the color can be divided into two parts, one is the color detection, and the other part is the color analysis. Whether detection or analysis is required very high, only two step_outs are handled properly measured color information is the most authentic and reliable.
Measurement is determined chromatic meter internal result, analysis is the international and national standards. In 1931 the National Commission on Illumination (CIE)for the analysis of colorimeter establish a series of color space standard of the visible spectrum . Basically for colorimeter analysis provides a theory standard and basis, CIE color space standard is CIE_XYZ, the establishment of this color space is the basis for standards_based visual ability of the observer to realize, that he responded to the standard people eye visible range of colors. In addition CIE_XYZ, CIE_xyY, CIE_Lab, CIE_Lch other standard color space, suitable for different industries and products.
Currently colorimeter is commonly used built_in color space CIE Lab color space, the color space to represent the color of the lightness L value, a value represents the value of the color red and green, b value represents the value of the color blue and yellow.
CIE Lab is mainly defined of really product color different value, generally used for all types of colorimeter color to control change. Lab values of a single set of little practical significance, but can only through the Lab when compares two color difference value to judge the difference between them.Precision colorimeter can measure the Lab values of the object obtained by analyzing the difference between the two colors. Lab value through long_term observation of the results we find that when the difference between Lab values greater than 1:00 naked eye can clearly feel the presence of chromatic aberration. Now the industry to save time and improve productivity, are generally used a pre_set tolerance range, during the quality control sample measured as long as the tolerance range on qualified, whether the person is ineligible. So not only can control the color quality of the products while increasing efficiency. By using the Lab color space, our production control to achieve the data.
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