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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