I have a .tif which I want to have polygonized. I take the Raster/Conversion/Raster to Polygon. QGIS 3.12 starts the process but never ends (once I waited half an hour). I maybe don't see a mistake.
White has the value 1 and black the value 0. I also tried with ArcMap where it is the same: The process starts but it never ends.