In more detail
Accuracy depends on image quality: a resolution around 300 dpi, high contrast, straight lines and common fonts give the best results. Always proofread the output, since similar characters such as 0 and O are easily confused.
Glossary
Design & Media
OCR (optical character recognition)
OCR converts text in an image or scan into editable, searchable text.
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See also
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Glossary
Resolution and PPI
Resolution is the number of pixels in an image (such as 1920 × 1080).
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Glossary
Unicode
Unicode is the universal standard that gives every character in the world's writing systems, plus symbols and emoji.