Manual:$wgThumbLimits

Thumbnail settings: $wgThumbLimits
List of image sizes users can pick from.
Introduced in version:	1.5.0
Removed in version:	still in use
Allowed values:	array of positive integers
Default value:	(see below)

Other settings: Alphabetical | By Function

Details

Thumbnails on image pages are adjusted according to a user setting. In order to reduce disk usage, the values can only be selected from a list. This is the list of settings the user can choose from.

Default value

$wgThumbLimits = array(
        120,
        150,
        180,
        200,
        250,
        300
);