Advanced Image Compression Techniques - IndustryConf 2015

Image assets are a major impediment to page load times. Best practices for common image compression have been evangelized. To further reduce image byte size, we have to get creative: discover how to apply lossy compression to lossless formats, automatically detect good compression levels and learn how disciplines like computer vision and machine learning can help us to improve image compression.

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2. Advanced
   Image
   Compression
   Techniques
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4. #IndConf
   @tbaldauf
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12. Workarounds
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13. http://is.gd/rwdbook
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16. 2,7 MB
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17. 0,7 MB (26%) JPEGs
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18. 34p
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20. www.webpagetest.org/
    getkey.php
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22. MozJPEG
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23. speakerdeck.com/tbaldauf
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24. Lossless: 10.5% median
    byte size savings
    for The Chronicle
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25. Lossy at q75
    19.6%
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27. Lossy at q59
    44.5%
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28. HALFED!
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29. q59
    ?!?
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30. JPEG Quality is void
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31. Tool of Choice:
    DSSIM
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32. Measure Dissimilarity
    https://github.com/
    pornel/dssim
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35. Dissimilarity:
    0.13%
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36. ~1.5% ok
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37. Automate!
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38. cjpeg-dssim
    https://github.com/
    technopagan/cjpeg-dssim
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40. Adaptive JPEG quality
    based on
    Round Trip Times
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45. MSSS
    http://github.com/
    technopagan/mss-saliency
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49. It's coming to
    MozJPEG
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52. Strategy
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53. Interface Elements: CSS
    Icons: SVG
    GIF (unless multiple frames): PNG8
    Chrome: WebP
    Internet Explorer: JPEG-XR
    PNG24 + Full Alpha + < 16bit: PNG8 + Full Alpha
    PNG24 + Full Alpha + 24bit: JPEG + Transparency
    [...]
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58. Compress Images
    for great UX
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59. Better #WebPerf equals
    Increased Conversions
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61. Ready! Set! Go!
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62. Install MozJPEG
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63. Automate Worklow
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64. Create Milestones for
    Image Management
    Strategy
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65. Thank You!
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66. Tobias Baldauf
    @tbaldauf
    tbaldauf@akamai.com
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