v0.4.0

🎨 Smart Format & Alpha Handling + Rust 2024

This release brings intelligent format handling, proper alpha channel support, and upgrades to the latest Rust edition!

✨ New Features

Intelligent Alpha Channel Handling

bgone now correctly processes images with existing transparency:

• Translucent pixels are pre-composited over the background color
• Background auto-detection composites translucent edges over black
• Works perfectly with PNG files, anti-aliased edges, and semi-transparent graphics

Example: A semi-transparent red pixel rgba(255, 0, 0, 128) on white background → rgb(255, 127, 127) before processing

Smart Format Selection

Automatic output format conversion for formats without alpha support:

• JPEG/BMP input → PNG output (preserves transparency)
• Formats with alpha (PNG, WebP, TIFF, GIF, etc.) → preserved
• Case-insensitive extension handling

bgone photo.jpg        # → photo-bgone.png (auto-converted!)
bgone logo.png         # → logo-bgone.png (preserved)
bgone image.webp       # → image-bgone.webp (preserved)

🔧 Improvements

Rust Edition 2024 Upgrade

• Upgraded from Edition 2021 → 2024
• New syntax: let-chains in if statements
• Modern patterns: RangeInclusive::contains()
• Cleaner code: removed unnecessary let-bindings and closures
• Zero clippy warnings

Documentation Cleanup

• Simplified "Supported Formats" section
• Clearer, more concise README
• Better examples with inline comments

🧪 Testing

• 82 tests (added 7 new tests)
• Full coverage for alpha compositing
• Format conversion test coverage
• All tests passing

📦 Installation

# Homebrew
brew upgrade bgone

# Cargo
cargo install bgone --version 0.4.0

This release makes bgone more intelligent, modern, and user-friendly while maintaining backward compatibility!