I want to use images with perfect soft edges but the alpha channel of a tga is difficult to draw precisely. What I know is that tga can't preserve its transparent area. Even if I draw in photoshop with transparent background and save as 32 bits tga, gamestudio still need an alpha channel to know how to draw the transparent part.

So why gamestudio can only use bmp, pcx and tga? Why png is not supported?
While other game engines generally support png, gamestudio doesn't. This seems as gamestudio is degraded.