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Left-side book fold shadows have a V-shape: brightness dips from the edge toward a peak at ~5-10% of width, then rises again. The previous algorithm scanned from the edge inward and immediately found a low dark fraction (0.13 at x=0), missing the gutter entirely. Now finds the PEAK of the dark fraction profile first, then scans from that peak toward the page center to find the transition point. Works for both V-shaped left gutters and edge-darkening right gutters. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>