%20-%20https://sketchapp.com%20--%3e%3ctitle%3e形状%3c/title%3e%3cdesc%3eCreated%20with%20Sketch.%3c/desc%3e%3cg%20id='页面1'%20stroke='none'%20stroke-width='1'%20fill='none'%20fill-rule='evenodd'%3e%3cg%20id='大兔搜索图片页-英文版'%20transform='translate(-244.000000,%20-22.000000)'%20fill='%23767676'%20fill-rule='nonzero'%3e%3cg%20id='大作顶栏-跟屏'%3e%3cg%20id='搜索框'%20transform='translate(220.000000,%2011.000000)'%3e%3cg%20id='搜索按键'%20transform='translate(24.000000,%2011.000000)'%3e%3cpath%20d='M11.4351058,10.0628931%20L10.7124071,10.0628931%20L10.4562607,9.8158948%20C11.352773,8.77301315%2011.89251,7.41909663%2011.89251,5.946255%20C11.89251,2.66209262%209.23041738,0%205.946255,0%20C2.66209262,0%200,2.66209262%200,5.946255%20C0,9.23041738%202.66209262,11.89251%205.946255,11.89251%20C7.41909663,11.89251%208.77301315,11.352773%209.8158948,10.4562607%20L10.0628931,10.7124071%20L10.0628931,11.4351058%20L14.6369354,16%20L16,14.6369354%20L11.4351058,10.0628931%20Z%20M5.946255,10.0628931%20C3.66838193,10.0628931%201.82961692,8.22412807%201.82961692,5.946255%20C1.82961692,3.66838193%203.66838193,1.82961692%205.946255,1.82961692%20C8.22412807,1.82961692%2010.0628931,3.66838193%2010.0628931,5.946255%20C10.0628931,8.22412807%208.22412807,10.0628931%205.946255,10.0628931%20Z'%20id='形状'%3e%3c/path%3e%3c/g%3e%3c/g%3e%3c/g%3e%3c/g%3e%3c/g%3e%3c/svg%3e)
%20-%20https://sketchapp.com%20--%3e%3ctitle%3e路径%3c/title%3e%3cdesc%3eCreated%20with%20Sketch.%3c/desc%3e%3cg%20id='页面1'%20stroke='none'%20stroke-width='1'%20fill='%23333333'%3e%3cg%20id='图意搜索2'%20transform='translate(-258.000000,%20-190.000000)'%20fill-rule='nonzero'%3e%3cg%20id='编组-26'%20transform='translate(258.000000,%20186.000000)'%3e%3cg%20id='编组-19'%3e%3cpath%20d='M11.3793501,11%20C11.2184103,11%2011.0575763,10.9353093%2010.9360197,10.8063021%20L6,5.56791848%20L1.06398812,10.8063021%20C0.824070393,11.0609268%200.431064101,11.0650429%200.186257866,10.8154807%20C-0.0585907019,10.5658966%20-0.0625480588,10.157172%200.177411997,9.9025253%20L5.55671586,4.19369791%20C5.67346862,4.0698193%205.83324448,4%206,4%20C6.16676336,4%206.32656037,4.06981928%206.44329198,4.19369791%20L11.8225958,9.9025253%20C12.0625559,10.157172%2012.0585774,10.5658966%2011.81375,10.8154807%20C11.6929552,10.938611%2011.5360997,11%2011.3793501,11%20Z'%20id='路径'%20transform='translate(6.000000,%207.500000)%20scale(1,%20-1)%20translate(-6.000000,%20-7.500000)%20'%3e%3c/path%3e%3c/g%3e%3c/g%3e%3c/g%3e%3c/g%3e%3c/svg%3e)
Quick answer：A 'lightness purity color image' refers to an image that emphasizes the purity of color and the variation in lightness. In the field of colorimetry, this type of image might be used to analyze the saturation and brightness of colors. It is often used in graphic design, art, and scientific research to study color perception and representation.
