How do I turn a certain colour solid?

I've set up a mapping function to plan out dungeon levels using various shapes. This results in black or white pixels. Is there a simple way to detect what's where and turn things solid if they're one or the other?

So you have an image where each pixel represents a tile on a map?

You can paste this image onto DrawingCanvas, then read pixels from the canvas:

DrawingCanvas paste Map
Wait 0
DrawingCanvas Save Snapshot
Wait for previous actions to complete

Wow, thanks. You've completely sent me back on the right track! I've been stuck for a while and didn't realise there was a Drawing canvas (whoops).

Rather than using an image, you could instead use a tile map object, that way you can easily tell if a tile is 0 or 1 etc.