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Closes #

## Proposed Changes

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## Checklist (new metrics only)
- [ ] Add docstrings for functional and class interfaces
- [ ] Add tests
- [ ] Compute values for `i01_01_5.bmp` <-> `I01.BMP` and `goldhill_jpeg.gif` <-> `goldhill.gif`
(in `tests/assets`) using original implementation, verify that your results match.
- [ ] Update table with metrics in `README.rst`
- [ ] Update benchmark values in `docs/source/_static/benchmark.csv`
- [ ] Update examples
