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Scanner OCR Errors — Text Recognition Failures and Scan Quality Issues

Informationalgeneral

Overview

Fix scanner OCR (Optical Character Recognition) errors including garbled text, missing characters, and poor recognition accuracy from scanned documents.

Key Details

  • OCR converts scanned images of text into editable and searchable text
  • Scan quality directly affects OCR accuracy — higher DPI and cleaner images produce better results
  • OCR engines struggle with handwriting, decorative fonts, colored backgrounds, and low contrast
  • Document orientation (skew) significantly reduces OCR accuracy
  • OCR for multiple languages requires the correct language pack installed

Common Causes

  • Scan resolution too low — OCR needs at least 300 DPI for reliable text recognition
  • Document skewed or rotated on the scanner bed causing angled text
  • Low contrast between text and background (light gray text on white paper)
  • Dirty scanner glass causing spots, streaks, or blurry areas in the scan

Steps

  1. 1Scan at 300 DPI minimum for text documents — 600 DPI for small text or poor quality originals
  2. 2Use black and white (not color or grayscale) scan mode for text-only documents for best OCR results
  3. 3Clean the scanner glass with glass cleaner and lint-free cloth before scanning
  4. 4Place the document squarely on the scanner — even 2-3 degrees of skew reduces OCR accuracy
  5. 5Use dedicated OCR software (Adobe Acrobat, ABBYY FineReader, or free alternatives like Tesseract) for better accuracy than built-in scanner OCR

Tags

ocrscannertext-recognitionscan-qualitydocument

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Frequently Asked Questions

300 DPI is the standard for normal text. Use 600 DPI for small fonts, poor quality originals, or detailed documents. Higher than 600 DPI rarely improves OCR accuracy and creates unnecessarily large files.