Feasibility study on quality evaluation of Jadeite-jade color green based on GemDialogue color chip

Abstract

The paper studied quality evaluation of Jadeite-jade color green through GemDialogue. There are five green-related color codes in GemDialogue, including G2Y, Y2G, G, B2G and G2B. After parametric analysis on three measured color masks with different combinations, we clarified the color change rules of different color codes and zones superimposed by different color masks. First of all, based on CIE 1976 L*a*b* uniform color space system, the color range of 728-piece Jadeite-jade color green was determined: L*∈(5.64, 64.17), h0∈(125.21, 171.10), and C*∈(10.53, 85.89), namely conforming the appearance characteristics of Jadeite-jade color green. Then, five green-related color codes in GemDialogue color chip system were selected to test the color changes of 50 color bands with combination of three color masks in different superposition forms. The changes of color hue, lightness and chroma between the color codes and zones before and after combination were considered as the indicators. The results show that changes of hue angle for standard green color codes is consistent with that of yellow color codes, but opposite to that of blue color codes. In the process changing from yellow to blue, the overall lightness moves from high to low values, in line with the sensory fact that naked eyes perceives higher lightness of yellow color than that of the blue. The overall color chroma of five color bands significantly reduces with fading yellow hue and increasing blue hue.