这篇写得最精确了。 教程十八:JPG文件长度与质量https://www.cnblogs.com/stronghorse/p/7225069.html JPEG色彩断层分析https://uploadcare.com/blog/fighting-jpeg-color-banding/ YUV Gammahttps://computergraphics.stackexchange.com/questions/320/should-jpeg-encoding-take-into-account-gamma