Actually the usual method is to do a scene by placing objects with their collision polygons, and bounding boxes as collision detection. Large composite images are not recommended.
construct.net/en/blogs/construct-official-blog-1/remember-not-waste-memory-796
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I think the editor is set to stop at 16.
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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.
Member since 12 Nov, 2008