[MediaWiki-l] Image thumbnailing in MediaWiki

Krabina Bernhard krabina at kdz.or.at
Mon Jul 31 09:25:49 UTC 2017


Dear all,

thank you for your help, it is much appreciated.

An additional question regarding thumbnailing: do thumbs ever get deleted by MediaWiki?
They probably get deleted once the image gets deleted. But other than that, do all generated thumbnails exist as long as the image exists?

cheers,
Bernhard


----- Am 29. Jul 2017 um 2:22 schrieb Brian Wolff bawolff at gmail.com:

> 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 at 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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