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I've used Acrobat's OCR functionality in the past and have never experienced such a greater loss of quality with lack of text recognition.
I have a large screenshot with rows of data that I'd like converted to text. In my experience this quality is more than sufficient to perform OCR. I enhanced the scan using: to JPEG, Monochrome CCITT Group 4 at the highest quality.
After OCR the text is completely illegible. It looks like I downsampled it to 36ppi. Below is the before and after.
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