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My ultimate goal is same as here
Here is my steps:

  1. The image is created using Python and saved as PNG format:

enter image description here

  1. Import the image into QGIS using Georeferencing tool and saved as TIFF: enter image description here

  2. Reclassified the image value using Raster -> Raster Calculator in order to use processes such as r.thin and r.to.vect later according to here: enter image description here

  3. But the result is weird: wrong result

Not sure what's wrong here.
Or are there any other solutions?

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