Dont understand the over node


sorry about this stupid question but:
i have to put an image over a second image. The first one has a quickshape mask. But the area of the forground image is always too bright. When selecting the premultiplied button the forground disappears.

What happens?

Thanks again for help,


A + (B * (Aalpha [size=3]* -1 ))[/size]


in the file in node turn on auto alpha


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