Maskblend Vs Alphablend

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tonyg
 #1
Hmm, still confused.
Why doesn't this apply any alphblend to the second image?
Graphics 800,600,0
image:TImage=LoadImage("max.png")
cls
SetBlend maskblend
'setblend alphablend
'setalpha 1.0
DrawImage image,0,0
SetAlpha alphablend
SetAlpha 0.6
DrawImage image,100,0
Flip
WaitKey()

when the alphablend does?