construct.net/en/make-games/manuals/construct-3/plugin-reference/drawing-canvas
It's a seperate object.
Construct 3 can't do per pixel comparisons every tick, you will have to make a stand in collision detector.
The only thing that is viable is the Tilemap object. Fyi it can be invisible.
There are a few templates In C3.
You would need to preprocess it using Drawing Canvas to get the alpha, and set tiles on a Tilemap for collisions.
It's not a process you should plan on doing every tick.
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The scenario where you are constantly creating new objects and instances.
Its advised not to use it unless you can deal with the timing well.
Think of it like you would a stack.
I believe its object index with recycling.