Given a white circle on a black background (in a 8 or 16 bit image), applying the Wand Tracing Tool to the black background does not exclude the circle from the resulting selection. This is independent of Wand Tool Tolerance or Mode.
When the circle is connected somehow via a white structure to the edge of the image it works fine, but not if the circle (or any other structure) is free within a black background.
This seems strange to me, can someone explain?
thanks a lot