[MediaWiki-l] Image thumbnailing in MediaWiki

Bill Traynor btraynor at gmail.com
Tue Aug 1 15:17:05 UTC 2017


Wouldn't deleting the thumb subfolder regenerate them on an as needed basis?

On Tue, Aug 1, 2017 at 10:51 AM, [[kgh]] <mediawiki at kghoffmeyer.de> wrote:
> Building up on this information:
>
> I have once tried to switch from "regular thumb handling" to "404 thumb
> handling" on an existing wiki and found that this does not work since as
> a result no thumbs were rendered at all. Starting with "404 thumb
> handling" on a fresh wiki however works fine. I have not dug into this
> more but may it be that all existing thumbs have to be deleted to clear
> the way for the new handling mode when switching the mode on wiki
> already in use?
>
> Cheers Karsten
>
>
> Am 31.07.2017 um 15:52 schrieb Brian Wolff:
>> Thumbnails will generally not be deleted except if an image is deleted,
>> overwritten with another file or purged (ie appending ?action=purge to the
>> file description page)
>>
>> --
>> bawolff
>>
>> On Monday, July 31, 2017, Krabina Bernhard <krabina at kdz.or.at> wrote:
>>> 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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