So lets say I'm making a banner and I want to have a black background. How can I easily remove the gray fuzz around a tori and allow the tori to look like he blends in with the background. (Don't say shaders thats not what I need)

Thanks.

Use GIMP to edit it out by selecting a range of colors with the "color selector" tool or whatever it's called. Then you can make it have a transparent background by making an alpha channel on the layer. Actually do that first and then do the color corrector. Hope this helps!