Lucida Background Removal

Use the bgr executable from egeorcun/lucida. Preserve the source image and create a separate transparent PNG.

Workflow

1. Resolve the input image and confirm it exists.

2. Use the user's output path when provided. Otherwise, write <input-stem>-transparent.png beside the input. Do not overwrite the source unless the user explicitly requests it.

3. Check whether bgr is available:

   bgr --help
   

   Note: If the current environment is sandboxed (for example: Codex sandbox), run all bgr commands in the user's normal terminal. Otherwise the bgr --help command process might be freezed or timeout.

4. If bgr is missing, verify that uv is available and install the CLI: