[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 nosilver4u):

 @SirLouen The png8 option does indeed perform a quantization, I don't know
 whether it is immediate, or delayed until the image is written.
 Originally, I had attempted to do something like `$image->writeImage(
 'PNG8:' . $output_file );`. Unfortunately, that tended to crash, but
 `setOption` works just fine. See
 https://github.com/Imagick/imagick/issues/672 for more context, including
 why we need the png8 operation for grayscale images.

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Ticket URL: <https://core.trac.wordpress.org/ticket/63448#comment:59>
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