- http://paulbourke.net/miscellaneous/equalisation/
- https://pdfs.semanticscholar.org/presentation/3fb7/fa0fca1bab83d523d882e98efa0f5769ec64.pdf
- https://www.comp.nus.edu.sg/~cs4243/doc/SciPy%20reference.pdf
- https://en.wikipedia.org/wiki/Floyd%E2%80%93Steinberg_dithering
- https://en.wikipedia.org/wiki/Floyd%E2%80%93Steinberg_dithering