Mask with bitmap

Questions
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1

Mask with bitmap, How can i do that?

2 
obj.effect(new AlphaEffect(new Pic(url)))

Some examples and more info here DOCS - ZIM JavaScript Canvas Framework - Documentation

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3

What mask were you using? I am trying to do an "erase" mask by having two pictures one on top of the other and erase the top one to reveal the bottom one?

4

Check out

And

It does not have two pictures but just put a second picture at the .bot()

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