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The min-channel correctly extracts contrast (white text=255 vs green sticker bg=130), but Tesseract expects dark text on light background. Without inversion, the grayscale-only path returned empty text for every PSM mode because Tesseract couldn't see bright-on-dark text. Invert via bitwise_not: text becomes 0 (black), sticker bg becomes 125 (gray). Fixes all three OCR paths (adaptive, grayscale, Otsu). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>