Thread:Project:Support desk/When thumbnailing .GIFs, black disappears. Anyone had this issue or know how to sort it?/reply (3)

MediaWiki uses ImageMagick or GD to convert gifs. It may be that your converter doesn't understand gif transparency. If you can, install ImageMagick and read up on images in MediaWiki.

BTW, added your wiki to the WikiApiary. It looks like a pretty nice site.