Are all JPEG compression implementations the same?

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  • mozjpeg

    Improved JPEG encoder.

  • No.

    See https://github.com/mozilla/mozjpeg

    Also, there is a fairly big problem with JPG that the ‘quality’ setting is not calibrated. That is you might look at one image and think it looks fine (which is subjective, depends on what you want to use the image for…) with a quality of 60%, but then you compress a million images at that rate, delete the originals, then you find that many of them look really awful. Not only that but there are images you could have compressed more and still been happy with the output.

    If you are publishing images for the web consider using WebP which is consistently better, well supported now, and has a calibrated quality knob.

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