🖨️ DESIGN · Visuals & 3D Level: Beginner ⏱ 10 MIN Free & Open Source

Restore Skewed, Shadowed Phone Scans of Worksheets & Handouts into Crisp Printable PDFs

Fix skewed angles, phone shadows and gray backgrounds on photographed documents or worksheets so they print like crisp flatbed scans.

CORE TOOLS OpenCV / PaperEdge (Open Source), Upscayl, Python

BEST FOR Parents, teachers, legal/admin staff, office workers

REQUIREMENTS Phone photos of documents; Python or free image tools

✦ WHY THIS WORKFLOW

Commercial scanner apps lock batch PDF export and watermark removal behind subscriptions. A 30-line local OpenCV script cleans 100 pages in seconds for free.

✦ Interactive Workflow Animation Preview

Step-by-Step Action Checklist

0 / 4 Completed

✓ Step 1 [Four-corner perspective de-skew]: Detect page edges and warp the skewed photo into a flat A4 rectangle.
✓ Step 2 [Remove illumination shadows]: Apply morphological background division and adaptive thresholding to turn uneven gray shadows pure white while sharpening printed text.
✓ Step 3 [Filter colored ink if needed]: Strip red grading marks or blue pen handwriting in HSV color space to recover a blank practice worksheet.
✓ Step 4 [Export clean monochrome PDF]: Bundle the cleaned pages into a lightweight, toner-friendly PDF.

READY-TO-USE PROMPT TEMPLATE

Open Official Tool / Repo ↗

Write a local `Python + OpenCV (cv2) + Pillow` batch script to clean up phone-photographed [contracts with shadows / graded school worksheets]:
1) Use morphological background division to remove uneven lighting shadows and make the paper pure white;
2) Include an optional HSV color-mask filter to strip red and blue handwriting while keeping black printed text;
3) Merge all cleaned pages into a single `clean_print.pdf`.

Use Cases & Tags:

Erasing handwriting from school worksheetsRemoving gray shadows from phone-scanned contractsBleaching yellowed handouts for printingDe-skewing whiteboard photos

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