[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:  (none)
     Type:  defect (bug)                         |      Status:  new
 Priority:  normal                               |   Milestone:  6.8.2
Component:  Media                                |     Version:  6.8
 Severity:  critical                             |  Resolution:
 Keywords:  has-patch needs-testing needs-unit-  |     Focuses:
  tests                                          |
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Comment (by nosilver4u):

 Replying to [comment:19 siliconforks]:
 >
 > Did anyone try using `getImageProperty()`?
 >
 > I tried it with `'png:IHDR.color_type'` and `'png:IHDR.color-type-orig'`
 and they seemed to work...

 I sure didn't, that's a good find! I ran it through my entire PNG test
 folder, and all matched on `png:IHDR.color_type`. Seems `png:IHDR.color-
 type-orig` is not set initially. It must get set once the image has been
 scaled. Interestingly, it seems the IHDR.color_type doesn't get
 overwritten after the image resized. At least not immediately, but it
 might be worth checking both values for a color type of 3 just to be safe.

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Ticket URL: <https://core.trac.wordpress.org/ticket/63448#comment:20>
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