[wp-trac] [WordPress Trac] #49995: WordPress creates unnecessary thumbnails

[WordPress Trac]

#49995: WordPress creates unnecessary thumbnails
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 Reporter:  XXVII         |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Media         |    Version:  5.4
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Hello,
 I think I found a bug in WordPress 5.3 onwards, when **imagick is
 installed and activated** on the server (PHP 7.3, phpinfo attached).

 To reproduce the problem:

 1 - in /wp-admin/options-media.php check what sizes are set (defaults are:
 1024x1024, 300x300x 150x150)

 2 - upload an image with the same size as one of the three, let's say I
 upload this image https://via.placeholder.com/1024x1024

 3 - Wordpress uploads the image and generates the following files
 1024x1024.png           -> original image
 1024x1024-1024x1024.png -> SHOULD NOT BE CREATED
 1024x1024-768x768.png   -> medium_large
 1024x1024-300x300.png   -> medium
 1024x1024-150x150.png   -> thumbnail

 1024x1024-1024x1024.png should not be generated, it's also bigger than the
 original (3.5kB vs 6.3kB).

 The same thing happens with the other sizes as long as the image size is
 the same as one of the sizes set in the options.


 It doesn't happen on Wordpress 5.2.x and downwards.

 To solve the problem imagick must be deactivated, using GD the problem
 doesn't happen.

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Ticket URL: <https://core.trac.wordpress.org/ticket/49995>
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