How to fill particular areas in texture paint? I tried to Google this for hours but couldn't find how to do this. I have an object with a texture that has a completely closed black circle. See this example: 

What happens it that if I try to fill my inner circle with orange, the whole circle fills. I wanted fill only the inner circle (similar colors). I was hoping if someone could tell how to accomplish this. Thanks!
You can use the UV Image Editor Fill tool and play with the threshhold settings to see how well the fill works without spilling into the area around the colored area.