HELP! Blending/Alpha question!

Has anyone had any luck saving a png file from The Gimp? I’m using Gimp 2.0 and I’ve been unable to create textures with the proper colour depth… I’m getting what looks like 256 as well - though Alien Flux views just fine. I’m using SPGL, Sprites and the SpriteEngine so it’s not my texture loading code.

If anyone’s done this, kindly tell me how to save my png files properly. Or what other free tool to use;)

Thanks,

Bill