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Two fixes for marker column content (e.g. red "!" marks): 1. Skip _clean_cell_text() noise filter for column_marker — it requires 2+ consecutive letters, which drops punctuation-only markers like "!" or "*". 2. For marker columns, detect coloured pixels via HSV saturation check (S>80) in addition to grayscale darkness. Create a binarized image where both dark AND saturated pixels become black foreground, so Tesseract can see red markers that appear near-white in standard grayscale conversion. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>