Hi,
MediaWiki will by default only create image thumbs for needed sizes at
time the size is used on a page. So for example when you add an image
to a page, MW will create the thumbnail sizes needed to display an
article. However, if the image is uploaded but never added to a normal
page, then thumbnails for the image won't be generated (except for
those needed on image description page, which are different sizes)
There is a second mode mediawiki can operate in, where images are
rendered on demand when someone views the image (so-called "404 thumb
handling"). Wikimedia wikis use this mode. In this mode, thumbs are
created on first view. Additionally in this mode, $wgImageLimits
creates additional links on the image description page. This mode is
generally more efficient (especially on page saves), and also more
reliable in the event that there is a missing thumb.
For information to set up 404-thumb rendering see
https://www.mediawiki.org/wiki/Manual:Thumb.php
--
Brian
On Fri, Jul 28, 2017 at 9:18 AM, Krabina Bernhard <krabina(a)kdz.or.at> wrote:
Dear MediaWiki experts,
I cannot really figure out the behaviour of MediaWiki regarding thumbnailing. What I want
to achieve is that my MediaWiki installation produces thumbnails in a specified size.
What I did after reading through several help pages is this:
---------------------------
# Images und Thumbnails
$wgThumbLimits = array( 80, 250, 390 );
$wgDefaultUserOptions['thumbsize'] = 1; // thumb size 250
$wgImageLimits = array( array( 80, 90 ), array( 800, 600 ), array( 1280, 1024 ) );
$wgDefaultUserOptions['imagesize'] = 2; // image size 800, 600
---------------------------
In my opinion this should guarantee that for every image uploaded, there is an 80, 250
and 390px sized thumbnail. In many cases this is true, but there are some cases were I can
find a 100px thumbnail, but no 80px thumbnail.
If I understand it correctly, this can perfectly be the case if any user sets his/her
preference to 100px. I don't mind so much extra sizes to be produced, but I want to
make sure that a 80px thumbnail is there.
Maybe in the cases where it is not present the images were uploaded before the above
mentioned setting was made? But how can I get the wiki to redo thumbnails in my desired
size?
cheers,
Bernhard
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