Citeren Arjen de Korte <build+ho...@de-korte.org>:
Citeren Arjen de Korte <build+ho...@de-korte.org>:
Just recently, I noticed thumbnails for PDF attachments now show as
a black questionmark on a white background. Other attachments (JPG
files for instance) still show correct thumbnails, so I guess the
imagick PECL extension is still doing its job.
imp = 6.2.22
Horde_Core = 2.31.6
Horde_Pdf = 2.0.7
php7-imagick = 3.4.3
ImageMagick = 7.0.8
Am I the only one where this seems to be broken?
Answering to myself: it turns out the distribution I use (openSUSE
Tumbleweed) nowadays ships with a policy.xml file for ImageMagick
that prevents reading PDF files. Changing the policy from 'none' to
'read' fixed the generation of thumbnails.
Again answering to myself again. After looking up why PDFs are not an
acceptable input format for ImageMagick anymore, it turns out this was
switched off to address a vulnerability in Ghostscript:
https://www.kb.cert.org/vuls/id/332928
So the above suggestion to re-enable it in the 'policy.xml' may not be
safe depending on which Ghostscript version is currently installed on
your system.
Another way to deal with the ugly PDF thumbnails that are generated
now, is to switch off thumbnails for PDF files in
'imp/config/mime_drivers.local.php':
<?php
$mime_drivers['pdf']['thumbnails'] = false;
Choose your poison.
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