Apply bitmap mask to image on html5 canvas -

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good morning, have canvas background image, need put image on , apply mask on have transparency. here can find link sample of final result need. can me?

enter image description here

imagecontext.drawimage(mask, 0, 0, width, height); imagecontext.globalcompositeoperation = 'source-atop'; imagecontext.drawimage(img, 0, 0);

http://codepo8.github.io/canvas-masking/


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