ugly egdes with scaleimage

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Perhaps this is normal... but is it normal that the
transparency is out of control while blowing up an image
I have a 20x20 tile tileset and I want it to blow up
to 40x40 pixels. the alpha color is (ofcourse 255,0,255)
when i try to scaleimage the set the tiles contain a purple
edge (quite ugly)

I must say that I use the tformfilte
Is blowing up maybe a 3D technique? ? :)
in the early 3d games I saw this phenomenon quite often.

more importaint... can this be avoited?