I want to invert the colours of an area of the screen, imagine i have a sprite which is a circle and anything that sprite covers inverts the colours of the graphics underneath it.
Hey CrudeMik !
So what you need is a white tilde background, positioned and sized over the area you want to invert.
Add the effects "overlay" and "inverse" to it, and here you go.
Here is a sample capx demonstrating it. The overlay has drag&drop to test it out.
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That's awesome cheers!