Saving JPGs

Just curious, generally, how would one save to file formats like PNG and JPG? I'm trying to figure how much effort a 2d map-making tool would take to create, with tiles and such, for my DND gaming. Thanks!

P.S. Can't use FreeImage, because I don't use B+

if FreeImage is just an includable Dll, you can use it in B3d as well, since all you need is userlib support.