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VL Branko
VL Branko
Inspiring
January 2, 2021
Question

DW and JPEG 2000

  • January 2, 2021
  • 2 replies
  • 1425 views

Does DW (any version) support JPEG 2000? The reason I ask is that Google SEO suggested JPEG 2000 rather than JPG to speed up pageloads but my antediluvian version of DW doesn't recognize .jpf files.

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    2 replies

    Gail5ECD
    Gail5ECD
    Known Participant
    January 4, 2021

    I've seen the recommendations in Google Lighthouse too with its suggestions of using http2 etc.

    As long as your images are optimised for the size of the image dimensions you specify, you should be fine.

    Using photoshop export as jpeg with preset quality high or 60 has worked for 20 years so far.

    Page speed is something I am very keen on too.

    - "Good English is an Art."
    Nancy OShea
    Community Expert
    Nancy OSheaCommunity Expert
    Community Expert
    January 4, 2021

    I assume you mean Photoshop CC's File > Export > Export As panel and NOT the legacy Save For Web which is garbage.

     

    Assuming the JPG contains sufficient pixels for the target device (1x, 2x, 3x..), reducing Quality slider can significantly reduce file size without adversely effecting picture quality.  In this example, my original is 2.5MB but my compressed JPG is well under 100KB.  And reducing total pixels (W x H) will further reduce file size for smaller devices that may have low bandwidth data plans.

     

     

    Using Responsive Images.

    https://developer.mozilla.org/en-US/docs/Learn/HTML/Multimedia_and_embedding/Responsive_images

     

    Nancy O'Shea— Product User & Community Expert
    P
    Paul-M
    Legend
    January 2, 2021

    The short answer is don't use JPEG 2000 for your website images, read more about browser support and other issues here

    Paul-M - Community Expert
      VL Branko
      VL BrankoAuthor
      Inspiring
      January 2, 2021

      Thank you. Why on earth would google SEO recomend this? (Shakes head, and continues to use the Mighty Duck)

      Nancy OShea
      Community Expert
      Nancy OSheaCommunity Expert
      Community Expert
      January 2, 2021

      Hi @VL Branko,

      Long time no-see.   Happy new year!

       

      If you look carefully at the recommendation, Google tells developers in their Lighthouse Opportunities report to use all 3 Next-Gen Image Formats with fallbacks for non-supporting browsers.

       

      In truth, Google's image darling at the moment is WebP which Chrome supports.  But Chrome doesn't support either of the fallbacks.  So use your best judgement and take whatever Google says with a healthy measure of salt.

       

      Nancy O'Shea— Product User & Community Expert
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