[Tickets #14833] Re: Error when communicating with the server with PDF Attachements

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Ticket URL: https://bugs.horde.org/ticket/14833
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  Ticket             | 14833
  Updated By         | build+horde at de-korte.org
  Summary            | Error when communicating with the server with PDF
                     | Attachements
  Queue              | IMP
  Version            | 6.2.22
  Type               | Bug
  State              | Unconfirmed
  Priority           | 3. High
  Milestone          |
  Patch              |
  Owners             |
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build+horde at de-korte.org (2018-07-11 13:48) wrote:

Your version of imagick is indeed too old.  The reason for the changes  
is that Imagick::flattenImages() which was used previously in the  
generation of the PDF thumbnails was removed in 3.3.0:

https://pecl.php.net/package-info.php?package=imagick&version=3.3.0

The replacement  for this is

$im->setImageBackgroundColor('white');
$im->setImageAlphaChannel(Imagick::ALPHACHANNEL_REMOVE);
$im->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);

so this pulls in the requirement for this constant, which was added in  
3.2.0b2:

https://pecl.php.net/package-info.php?package=imagick&version=3.2.0b2

Note that 3.3.0 was released more than two years ago and 3.2.0b2 has  
been available for almost five years already, released mere weeks  
after 3.1.2 was released.