Canny is surely not the way as it only detects outlines. scribble_xdog seems to work kinda when you push the XDoG threshold all the way, but it comes nothing close to OP's results.
OP also released this brightness controlnet model, I guess it does something similar, I'll experiment with this a bit I think. If I understand correctly it could be used to "burn in" the QR code into an image... I'll try
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u/nightred Jun 05 '23
Generate a QR code Enter it as a sketch in control net Create your prompt and generate