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Image Compression Benchmarks

This compression ratio tests are implemented on compressors:

  • libjpeg-turbo-1.5.1
  • mozjpeg-3.2
  • guetzli-1.0.1
  • guetzli then mozjpeg

with 2 image set:

  • CMS images.
  • product images.

Notes:

  • libjpeg/ mozjpeg are lossless compression.
  • guetzli is lossy compression with default parameters, means butteraugli score ~ 0.97.

Prerequisites

  • ./install.sh
  • ./do_mozjpeg_tests.sh
  • ./do_guetzli_tests.sh
  • ./guetzli_then_mozjpeg.sh
  • ./compare.sh

Results

CMS images

  • Artifacts: 113 images (inputs/cms).
  • Low/ medium quality.
Image type Size Compare to inputs
inputs 4093 kB 0%
libjpeg 3876 kB -5% smaller
mozjpeg 3716 kB -9% smaller
guetzli 2672 kB -34% smaller
guetzli_then_mozjpeg 2582 kB -36% smaller

Product images

  • Artifacts: 493 images (inputs/products).
  • Good quality.
Image type Size Compare to inputs
inputs 79925 kB 0%
libjpeg 60094 kB -24% smaller
mozjpeg 55325 kB -30% smaller
guetzli 43703 kB -45% smaller
guetzli_then_mozjpeg 40172 kB -49% smaller

Conclusions

  • mozjpeg is 4.13% - 8% better than libjpeg.
  • The output of guetzli looks good, can't see the difference with human eyes.
  • The compression time of guetzli is extremely slow (On a c4.2xlarge instance, guetzli compression on 493 product images takes 66 minutes).