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What I want to do is go beyond simple image masking (nothing to do with text image masking). I know about canvas masking a vector shape, and rectangle clipping, but what if we want to use a black and white opacity map like a photoshop mask. Is it possible with html5 / css3? Is there a way to do it with canvas tag that I just haven’t realized?
There are only a few ways to mask an image right now. Webkit has -webkit-mask, while in Firefox, Mozilla prefers you to use an SVG mask to mask an image.
Here is an article on canvas masking