[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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Changes (by adamsilverstein):

 * status:  assigned => closed
 * resolution:   => fixed


Comment:

 In [changeset:"60246" 60246]:
 {{{
 #!CommitTicketReference repository="" revision="60246"
 Media: fix degraded handling for 24 bit PNG uploads.

 Add additional logic to correctly identify indexed PNG images so output
 PNGs correctly  match the uploaded image depth.

 Fix a regression introduced in WordPress 6.8 [59589] where uploaded
 Truecolor PNG images (meaning > 8 bit) were mis-identified as indexed (8
 bit) images, causing output images to be indexed instead of Truecolor
 resulting in a noticeable visual degradation.

 Props elvismdev, wildworks, SirLouen, siliconforks, joemcgill,
 iamshashank, nosilver4u.
 Fixes #63448.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/63448#comment:55>
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