[wp-trac] [WordPress Trac] #35725: Add WebP support.

[WordPress Trac]

#35725: Add WebP support.
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 Reporter:  markoheijnen                         |       Owner:
                                                 |  adamsilverstein
     Type:  enhancement                          |      Status:  assigned
 Priority:  normal                               |   Milestone:  5.8
Component:  Media                                |     Version:  3.5
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch needs-testing has-unit-    |     Focuses:
  tests needs-dev-note dev-feedback              |
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Comment (by adamsilverstein):

 @marylauc thank you for your feedback!

 > The recommended way to test for webp  support is to use the "accept"
 request header.

 Good to know this is a reliable approach. I was mainly considering the
 client side solution because page level caching is commonly used in
 WordPress, so all users get served the same (cached) page. Client based
 solutions would still work in these cases, server side would not.

 >Both imagemagick and GD use the libwebp encoder, so they should give very
 similar results. At most they might be using slightly different versions
 of the library or use different default settings.

 Good to know!

 One follow up question on Imagick vs LibGD: When researching animated
 image support (eg. animated gifs/pngs -> WebP), I found this ticket
 indicating webp.animated format is only supported in Imagick, not in GD -
 https://github.com/libgd/libgd/issues/648. Any feedback on this or how to
 detect library animated support?

 > The default quality setting (75) is the value we usually recommend for
 webp, but testing on a dataset and choosing a quality value that gives the
 DSSIM you want sounds like a great idea.

 Thanks for all the testing details. This will help us find the best values
 to match what we have in WordPress already although I don't want to redo
 testing others have already completed. I found this existing research -
 https://developers.google.com/speed/webp/docs/webp_study - are you aware
 of any others?

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Ticket URL: <https://core.trac.wordpress.org/ticket/35725#comment:120>
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