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Changelog

All notable changes to this project will be documented in this file.

[0.5.0] - 2025-12-07

Added

  • --trim CLI flag to crop output images to the bounding box of non-transparent pixels
  • trim_to_content() public function in library API
  • 8 new tests for trim functionality covering various edge cases

Changed

  • Updated all dependencies via cargo update
  • Migrated from deprecated assert_cmd::Command::cargo_bin() to cargo::cargo_bin!() macro in tests
  • Fixed clippy items_after_test_module warning by reorganizing lib.rs

[0.4.0] - 2025-10-06

Added

  • Intelligent alpha channel handling: translucent input pixels are pre-composited over the background color
  • Smart output format selection: formats without alpha support (JPEG, BMP) auto-convert to PNG
  • Comprehensive "Supported Formats" documentation section
  • 5 unit tests for alpha channel compositing
  • 2 unit tests for format conversion behavior

Changed

  • Upgraded to Rust Edition 2024
  • Applied clippy improvements: RangeInclusive::contains(), let-chains, unwrap_or optimization
  • Simplified README documentation for better readability
  • Background auto-detection now composites translucent edge pixels over black

Fixed

  • Images with existing alpha channels now process correctly instead of being treated as fully opaque
  • Case-insensitive file extension handling

[0.3.0] - 2025-10-06

Added

  • Optional output argument: automatically generates output filename with -bgone suffix when not specified
  • Auto-incremental naming: appends -bgone-1, -bgone-2, etc. when file already exists
  • Comprehensive unit tests for output path generation logic

Changed

  • Output argument is now optional in CLI (defaults to <input>-bgone.<ext>)
  • Updated all documentation and usage examples to reflect optional output
  • Simplified common usage pattern: bgone input.png instead of bgone input.png output.png

[0.2.0] - 2024-09-21

Added

  • Tie-breaker logic in color deduction to prefer colors furthest from background when reconstruction quality is equal
  • Mixed mode tests combining known and auto colors (e.g., --fg fff auto auto)
  • More comprehensive test coverage for translucent recovery scenarios
  • Named constants for algorithm thresholds

Changed

  • Improved color deduction algorithm to find more optimal colors (e.g., pure RGB when appropriate)
  • Increased candidate thresholds for better color selection:
    • 2 unknowns: 20 → 30 candidates
    • 3 unknowns: 20 → 25 candidates (full search) or 20 (selected)
  • Renamed "fully_auto" tests to "non_strict" for clarity
  • Updated README to run tests with --release flag by default for better performance

Fixed

  • Color deduction now properly handles cases with 3 unknown colors and many candidates
  • Test assertion messages now use consistent format
  • Reconstructed test images now correctly show the processed output overlaid on background

[0.1.0] - Initial Release

Features

  • Ultra-fast background removal using color unmixing
  • Support for multiple foreground colors
  • Automatic background color detection
  • Foreground color deduction with auto keyword
  • Strict and non-strict modes
  • Flexible opacity optimization
  • Comprehensive test suite