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The 5x5 MORPH_CLOSE was connecting scattered color pixels into one page-spanning contour that swallowed individual balloons. Fix: - Remove MORPH_CLOSE, keep only MORPH_OPEN for speckle removal - Lower sat threshold 50→40 to catch more colored elements - Filter contours spanning >50% of width OR height (was AND) - Filter contours >10% of image area Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>