Also.
In PSP when you use the 'magic wand' it leaves fairly jagged edges. Not sure if there is a feather setting for that or not.
Using the remove white or black plug in gives you more of a feathered edge. But it does leave some pixels that are what I call 'off color'. That is if you're using the remove white then any grey pixels will be left.
I'm still playing with it so that's about all I know at this moment.