kornelski
commented
6 months ago Differences between platforms are expected for multiple reasons. Optimization is not deterministic.
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macOS version uses Apple's image decoder with Apple's color profile processing. Other versions use LCMS2. These result in slightly different interpretations of color profiles due to different implementations.
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the library uses floating-point numbers. These may give slightly different results depending on compiler optimizations and math libraries in the OS.
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the library uses multi-threading. This is a source of randomness in the program. Different machines may use a different number of threads, and threads will run at different speeds, which randomizes order of operations.
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the library may use zlib provided by the operating system, and different versions of zlib may compress better or worse. For example on Debian Linux, you probably get a very old version of zlib.
I used pngquant on Linux and MacOS，I compressed the same pngs，but the result are different. Linux will compressed more png than MacOS，do you konw this issue？