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The previous algorithm used binary ink projection and found false splits at normal text column gaps. The spine of a book on a scanner has a characteristic DARK gray strip (scanner bed) flanked by bright white paper on both sides. New approach: column-mean brightness with heavy smoothing, looking for a dark valley (< 88% of paper brightness) in the center region that has bright paper on both sides. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>