[wp-trac] [WordPress Trac] #39216: PDFs with non-opaque alpha channels can result in previews with black backgrounds.

[WordPress Trac]

#39216: PDFs with non-opaque alpha channels can result in previews with black
backgrounds.
-------------------------------------------------+-------------------------
 Reporter:  gitlost                              |       Owner:  (none)
     Type:  defect (bug)                         |      Status:  new
 Priority:  normal                               |   Milestone:  Awaiting
                                                 |  Review
Component:  Media                                |     Version:  4.7
 Severity:  normal                               |  Resolution:
 Keywords:  dev-feedback 2nd-opinion has-patch   |     Focuses:
  has-unit-tests                                 |
-------------------------------------------------+-------------------------

Comment (by madejackson):

 Replying to [comment:11 maysi]:
 > Replying to [comment:9 mwtsn]:
 >
 > > In the file `wp-includes/class-wp-image-editor-imagick.php` after line
 153 (`$this->image->readImage( $filename );`) you can put in the code:
 > >
 > > {{{
 > > $this->image->setImageBackgroundColor('white');
 > > $this->image = $this->image->flattenImages();
 > > }}}
 >
 > This worked for me, too.

 Can confirm, This worked for me, too.

 The two other Solutions proposed in ticket #45982 did break the thumbnail-
 generation for me.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39216#comment:12>
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