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>

> Dear MediaWiki experts, > > I cannot really figure out the behaviour of MediaWiki regarding

> > 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,

> $wgDefaultUserOptions['imagesize'] = 2; // image size 800, 600 > --------------------------- > > In my opinion this should guarantee that for every image uploaded, there

> > If I understand it correctly, this can perfectly be the case if any user

> > Maybe in the cases where it is not present the images were uploaded

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: _______________________________________________ MediaWiki-l mailing list To unsubscribe, go to: https://lists.wikimedia.org/mailman/listinfo/mediawiki-l

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(a)kdz.or.at> wrote: by MediaWiki? that, do all generated thumbnails exist as long as the image exists? wrote: thumbnailing. thumbnails in 1280, 1024 ) there is an there are user sets produced, before the thumbnails _______________________________________________ MediaWiki-l mailing list To unsubscribe, go to: https://lists.wikimedia.org/mailman/listinfo/mediawiki-l

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

It should be fine to switch over an existing wiki, and ive done it before. I think its more likely something else was wrong, some config missing (if you had custom wgLocalFileRepos the config changes. If you have custom wgForeignFileRepos things may get more complicated. Older versions of mediawiki had an issue with wgUseInstantCommons being incompatible with 404 rendering, but that should be fixed now) or some weird incompatibility with something else. I know you wouldnt have them anymore, but mediawiki can be configured to generate logs that can be used to debug this sort of thing, and going directly to the thumb file in 404 rendering mode can also give helpful error messages. -- bawolff On Tuesday, August 1, 2017, [[kgh]] &lt;mediawiki(a)kghoffmeyer.de <mailto:mediawiki@kghoffmeyer.de>> wrote: to the <mailto:krabina@kdz.or.at>> wrote: deleted bawolff(a)gmail.com <mailto:bawolff@gmail.com>: sizes at normal &lt;krabina(a)kdz.or.at <mailto:krabina@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 >>>>> >>>>> _______________________________________________ >>>>> MediaWiki-l mailing list >>>>> To unsubscribe, go to: >>>>> https://lists.wikimedia.org/mailman/listinfo/mediawiki-l >>>> _______________________________________________ >>>> MediaWiki-l mailing list >>>> To unsubscribe, go to: >>>> https://lists.wikimedia.org/mailman/listinfo/mediawiki-l >>> _______________________________________________ >>> MediaWiki-l mailing list >>> To unsubscribe, go to: >>> https://lists.wikimedia.org/mailman/listinfo/mediawiki-l >>> >> _______________________________________________ >> MediaWiki-l mailing list >> To unsubscribe, go to: >> https://lists.wikimedia.org/mailman/listinfo/mediawiki-l > > > _______________________________________________ > MediaWiki-l mailing list > To unsubscribe, go to: > https://lists.wikimedia.org/mailman/listinfo/mediawiki-l >