• [Breaking] Remove --backup option. Use --out or --dir to preserve existing files.
• [Breaking] Remove --check option. Use --nx --nz to perform a non-optimizing run.
• [Breaking] API: Replace pretend option with OutFile::None.
• [Breaking] API: Move preserve_attrs into OutFile::Path.
• [Breaking] Default to removing interlacing. Use -i keep to retain existing interlacing.
• [Feature] Add Raw API for creating optimised PNGs from raw image data.
• [Feature] Add basic support for APNG files.
• [Feature] Add --scale16 option to forcibly reduce 16-bit images to 8-bit.
• [Improvement] Process multiple files in parallel.
• [Improvement] Improve reductions, particularly for indexed or very small images.
• [Improvement] Improve compression with latest version of libdeflate.
• [Improvement] Recompress iCCP chunks.
• [Improvement] Change recursive mode to only process .png/.apng files.
• [Improvement] Add support for glob patterns in quotes on Windows.
• [Improvement] Quieter default output logging, with multiple levels of verbosity.
• [Bugfix] Fix deadlock when using oxipng within an existing Rayon thread pool.
• [Bugfix] Fix early abort in recursive mode when a read error occurred.
• [Bugfix] Fix losing aux chunks when there's more than one of the same type.
• [Bugfix] Fix sometimes writing output even when it was larger.
• [Misc] Revamp CI workflow to upload artifacts and generate binaries for additional architectures.
• [Misc] Bump minimum Rust version to 1.66.0.