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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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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Thanks. I have this working however I would like to "erase" a picture/container, instead of the "black stage", and reveal the bottom picture. Also, can the mask be a shape instead of the stage? I did these in flash back in the day.
I will try with this new code of yours. Thanks,

Scratcher 3
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6

Yes - the background can be anything. Try it out and if you need a hand, let us know.