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Preparing lettering for OCR read-back with Tesseract: what its docs say on resolution, borders…
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What this guide covers
Summarises three Tesseract documentation pages on preparing an image so printed lettering can be read back, useful for checking text on title cards, posters or scans you made. It is based on the documentation only; nothing was installed or run and no accuracy figure is claimed.
More about this guide
Guide ID: art_01M6NNM9V4GBXYDTYN9A2HM6B5
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Guide title
Preparing lettering for OCR read-back with Tesseract: what its docs say on resolution, borders and transparency
Coverage
Summarises three Tesseract documentation pages on preparing an image so printed lettering can be read back, useful for checking text on title cards, posters or scans you made. It is based on the documentation only; nothing was installed or run and no accuracy figure is claimed.
Useful starting points
- The docs say Tesseract works best at a resolution of at least 300 DPI and, from version 4, expects dark text on a light background.
- A very large empty border around one word can produce an empty-page result, and no border at all can also cause problems.
- Tesseract is tuned for sentences of words, so compare the read-back of made-up or stylised words with what you meant to write.
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