|I have a scene using spots with halos and stuff.
Now I'd like to get it into the gimp and put it onto some wallpaper in a way that the spot halos are still a little transparent, and so that the solid objects aren't.
If I put anything behind my scene inside blender (like a horizon blend, using the world buttons for example), the effect is just what I want - only I want to export the image and do the overlay somewhere else, and of course I don't want to import the wallpaper to blender, because then I'd have to think about lighting and perspective.
Is there a way to save an image (TGA/RGBA sounds quite good for a format) such that the transparency information against the non-existent background is just kept as an alpha-channel?
If not: Put this on the wishlist