Added AlphaRangeMask effect to addons w/ example with sliders to vary parameters (and Photo w/ DepthMap in Alpha to play with too.)
https://www.construct.net/en/make-games/addons/222/alpharangemask
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Added another example on the addon listing from code from 2xTacker, they added Z elevation for a nice 3D parallax effect.
https://imgur.com/Xvau7kg