Making Hilbert Curve from image

In curve.py Python code to convert RGB or grayscale image to Hilbert Space-Filling Curve (also works with PNG)
In example.ipynb example of usage with visualization
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Prerequisites:

pip install numpy numpy-hilbert-curve

For running example.ipynb:

pip install -r requirements.txt

Original images(left), and reshaped Hilbert Curve images(right)
Because Hilbert Curve is 1-d(its length), line was reshaped to square to represent as image