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Sprocket rotation checkbox (use sprocket holes for more reliable detection)
Max rotation field (0.5-15°)
Keystone (perspective distortion) detection
Detects when film wasn't flat during scanning causing trapezoidal distortion
Combined detection using both methods for complete coverage:
Sprocket-based: measures convergence from sprocket boundary distances (one axis)
Edge-based: measures convergence from frame edge angles (both axes)
CLI flags:
--keystone outputs vertical and horizontal perspective correction values
--keystone-source selects detection method: combined (default), sprockets, or edges
Lightroom plugin:
Separate "Keystone Detection" section in Film tab
Source dropdown to select detection method
Results dialog shows relative adjustment values (add/subtract from current settings)
Values rounded to integers for Lightroom compatibility
Debug visualization shows both detection methods side-by-side
Fixed
Outlier regions from film base variance detection (e.g., light leaks) are now masked out during edge detection instead of being added as false edge hints