Detlef Faber wrote :

> I noticed that gimp adds such edges as anti-aliasing, so maybe this
> is something similar?

The color will full alpha is not defined and could be black or another 
ugly color that show up after filtering. I had better result by setting 
the whole image to white and then using the eraser to set the alpha 
channel.

-Fred

-- 
Frédéric Bouvier
http://my.fotolia.com/frfoto/              Photo gallery - album photo
http://fgsd.sourceforge.net/               FlightGear Scenery Designer


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