[wp-trac] [WordPress Trac] #63448: Image quality significantly degrades for resized PNGs with transparency in WordPress 6.8.1

[WordPress Trac]

#63448: Image quality significantly degrades for resized PNGs with transparency in
WordPress 6.8.1
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 Reporter:  elvismdev                            |       Owner:
                                                 |  adamsilverstein
     Type:  defect (bug)                         |      Status:  closed
 Priority:  normal                               |   Milestone:  6.8.2
Component:  Media                                |     Version:  6.8
 Severity:  critical                             |  Resolution:  fixed
 Keywords:  has-patch has-test-info dev-         |     Focuses:
  feedback has-unit-tests commit                 |
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Comment (by SirLouen):

 Replying to [comment:57 nosilver4u]:
 > @adamsilverstein No problem, I should have put my comments directly here
 instead of on the pull request! Agreed that we already have an improved
 solution, but would like to see quantizeImage() added back in to avoid
 regressions on indexed PNG images.

 I'm going to test this now, thing is that I found the png8 operation thing
 completely by chance. I got the exact same results in one of the images of
 the unit-tests and then I inferred (maybe wrongly) that png8 was actually
 doing a quantization in the background. I have not been able to find the
 source code of this imagick function to know what is been done behind the
 scenes, ngl.

 Btw, I recommend you to post in Trac for comments and use github
 exclusively for code reviews, because gh integration with Trac is
 sometimes buggy (messages don't show in Trac for some reason).

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Ticket URL: <https://core.trac.wordpress.org/ticket/63448#comment:58>
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