My personal tests to compare JPEG file size vs output quality
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README.md

README.md

ImageMagick Quality Tests

This is a quick and dirty test to get a feel for file size vs. image quality for JPEG files (as output by ImageMagick 6.6.7-9).

The goal was to figure out how Google Plus has such nice images with decent file sizes. Findings:

  • Google Plus uses a quality setting of ~80 (I had been using the ImageMagick default of 92 which led to very large files. ~4x the size of q80 but with very little difference in quality).
  • Google Plus strips EXIF and color profiles on all but the largest (2048px on the longest edge) sizes. This can lead to a ~30KB size reduction per image.