Thread:Project:Support desk/Can't resize image under a certain amount of pixels

Hello everyone, I am working on MediaWiki 1.24.2, PhP 5.3.8, and MySqQL 5.5.21. I am trying to display some Commons' images on my wiki, but I can't make some images smaller (especially the ones with the highest quality) as I get the thumbnail invalid parameters error. Even a low quality photo can be reduced until 400px, if I try with fewer pixels I get the error as well. I can't install ImageMagic for now, is there any explanation for this problem?