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On a heroku build that includes tesseract, you can find the data directory by logging into a dyno with heroku run bash and running: find ~+ -iname tessdata. Which In heroku-24 with tesseract 5.x that is probably:
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heroku config:set TESSDATA_PREFIX= "/app/.apt/usr/share/tesseract-ocr/4.005/tessdata/" |
This solution from: https://towardsdatascience.com/deploy-python-tesseract-ocr-on-heroku-bbcc39391a8d
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