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tinypng网站的算法和压缩原理是什么啊？ - 知乎 官网说的很清楚： When you upload a PNG (Portable Network Graphics) file, similar colors in your image are combined This technique is called “quantization” By reducing the number of colors, 24-bit PNG files can be converted to much smaller 8-bit indexed color images All unnecessary metadata is stripped too The result: better PNG files with 100% support for transparency 意思