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Asked: 2026-05-11T20:16:42+00:00

anyone know of a free open-source jpeg encoding library for C/C++? Currently I’m using

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anyone know of a free open-source jpeg encoding library for C/C++? Currently I’m using ImageMagick, which is easy to use, but it’s pretty slow. I compared it to an evaluation of Intel Performance Primitives and the speed of IPP is insane. Unfortunately it also costs 200$, and I don’t need 99% of the IPP). Also it will only work fast on Intel.

Anyone do any tests? Any other good libraries out there faster than ImageMagick?

Edit: I was using 8 bit version of ImageMagick which is supposed to be faster.

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1 Answer

  1. Editorial Team

    ImageMagick uses libjpeg (a.k.a Independent JPEG Group library). If you improve the speed of libjpeg, ImageMagick JPEG speed will increase.

    There are a few options:

    1. Compile an optimized libjpeg. If you have a modern gcc and at least a Pentium 4, you can try -O3 -msse2 and see if it can boost your speed. Then you can use LD_LIBRARY_PATH or some other way to load your libjpeg instead of the system one.
    2. Try out libjpeg-mmx. It is unmaintained, and supposedly buggy and with security flaws, but it may give a speed boost in your case.
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