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Robert Sachunsky authored
- add `negate-input` / `negate-output` toggles from otsu to other algorithm CLIs too (but keep `negate` as synonym for `negate-output` in sauvola; and don't add `negate-input` where this would require negation on RGB) - use the versatile io::magick::save instead of just io::pbm::save - rename output argument to `output.*` to reflect versatility
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