[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:  reopened
 Priority:  normal                               |   Milestone:  6.8.2
Component:  Media                                |     Version:  6.8
 Severity:  critical                             |  Resolution:
 Keywords:  has-patch has-test-info dev-         |     Focuses:
  feedback has-unit-tests commit fixed-major     |
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Comment (by SirLouen):

 Replying to [comment:66 nosilver4u]:
 > Here is the test script I wrote way back to illustrate this issue:

 This is the result using this script for the grayscale alpha image that
 @siliconforks provided

 [[Image(https://i.imgur.com/1IPJdJs.png)]]

 Also for the rabbit example these are my results:

 {{{
 Initial file info:
 Size of rabbit-time-paletted-or8.png is 200581 bytes
 Pixel depth of rabbit-time-paletted-or8.png is 8
 Color type of rabbit-time-paletted-or8.png is 3

 Final file info:
 Size of rabbit-time-paletted-or8.png-mod.png is 213153 bytes
 Pixel depth of rabbit-time-paletted-or8.png-mod.png is 8
 Color type of rabbit-time-paletted-or8.png-mod.png is 6
 }}}

 It grows in size, and the color type goes from 3 (indexed?) to 6 RGBA

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Ticket URL: <https://core.trac.wordpress.org/ticket/63448#comment:70>
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