[wp-trac] [WordPress Trac] #54648: Filter to let define the quality on subsize images

[WordPress Trac]

#54648: Filter to let define the quality on subsize images
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 Reporter:  Mte90        |       Owner:  (none)
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  Awaiting Review
Component:  Media        |     Version:
 Severity:  normal       |  Resolution:
 Keywords:               |     Focuses:  performance
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Comment (by codekraft):

 I think it's interesting and curious how I would have used completely the
 opposite example (even if MTE90's is however valid) as proof that this
 ticket would be really helpful...

 My example are **hdpi images** that can be compressed to insane levels
 without visibly losing quality, these are generally all the images between
 >2000px and fullsize, the ones that can make the uploads folder grow
 bigger... A jpg hdpi image compressed to 19% quality requires the same
 space as a mdpi image compressed to 51% quality **without loss of quality
 (but with twice the resolution)**. This happens because even if there are
 more artifacts due to higher compression these are "hidden" by the highter
 resolution. source: https://alidark.com/responsive-retina-image-mobile/

 example:
 MDPI 50kb 640x427:
 [[Image(https://i.imgur.com/MOUyOqd.jpg, 640px)]]
 HDPI 50kb 1280x854:
 [[Image(https://i.imgur.com/VS5VD9p.jpg, 640px)]]

 But of course I think that also compressing just a little bit the small
 thumb images is a good idea, in this way they are not "degraded" by
 compression since at that scale isn't really relevant the difference in kb

 ----

 In the future handling images quality will be useful also for webp/avif as
 well as jpg

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Ticket URL: <https://core.trac.wordpress.org/ticket/54648#comment:1>
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