Tileset needs fixing/tileset request?

Can someone please fix the transparency in this tileset because RPG Maker can't make black transparent for some reason and the black is so varied in actual coloration values due to jpeg artifacts that no level of fill tolerance will allow me to do anything without destroying the contents of the image. Is there a quick way to give the black area all the same RGB values?

Also, still looking for that Outback tileset. Also need tilesets for Carnival, Giant Tree and Beanstalk (Can supply mini/misc/alumni pieces for the latter's TileE; It won't need all 4 upper-layer files anyway)

No help yet?

Well, I believe SD-Arius owns or is active at http://www.rpgmakervx-fr.com/

I assume the tiles in non-jpg form will be there, so I suggest you register there to retrieve the tiles.

If it helps, These are the sorts of tilesets I'm requesting, plus a ski resort(though all I really need for that is all the stuff that'd make it a ski resort, like skis & ski lifts; I already have a winter tileset)