I'm using a free tileset from opengameart.org, but it's distributed as a .png file. Sphere Studio wants a .rts file. How do I import the file or convert it to .rts?
There's a built-in feature for it in the old editor that comes with the old version of Sphere:
(http://i.imgur.com/eXzDHsH.png)
I'm not sure if Radnen's Sphere editor has a similar feature.