Inspiring

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DW and JPEG 2000

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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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MikeB-S9UK

Known Participant

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.

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- "Good English is an Art."

Nancy OShea

Community Expert

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

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Nancy O'Shea— Product User & Community Expert

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Paul-M

Legend

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

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Paul-M - Community Expert

VL BrankoAuthor

Inspiring

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

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Nancy OShea

Community Expert

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.

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Nancy O'Shea— Product User & Community Expert

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