So for complex reasons I'm using a tilemap with 1x1 tiles that correspond to different colored pixels as terrain in a game.
How would I bring in an externally created image to the map part of the tile map? Designing them in Tiled or the built-in map editor is... implausible at any large size. :-/
You could use the canvas object to get the pixel colors.
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...I can't believe I missed that.
In reality, what I wanted was available allll the way back here:
Also thanks to you, R0J0hound!