Sounds like fringing to me. What does your color channel look like?
For example, if you wanted a green circle, the alpha channel would be black with a white circle, and the color channels would be solid green. If you have a green circle with black around it in your color channel, that black is getting pulled in by the filtering and showing up, creating a fringe.
Make sense?
For example, if you wanted a green circle, the alpha channel would be black with a white circle, and the color channels would be solid green. If you have a green circle with black around it in your color channel, that black is getting pulled in by the filtering and showing up, creating a fringe.
Make sense?