Manual:$wgSharpenParameter/hu

Részletek
A változóval az Imagemagick  paramétere állítható be. See the description of this parameter, and an explanation of the values it can take (although  does not take a threshold).

Note that the parameter is only passed to ImageMagick when, for a given image,
 * perimeter of the thumbnail being generated < ( &times; perimeter of the original image)