If You Still Have Problems; Potential Text Recognition Problems - Epson Expression 1680 Reference Manual

4. Use the Threshold slider to change the threshold value,
monitoring the results of your changes in the Preview
window. Depending on the lightness, darkness, and
complexity of the background on which the text is printed,
increasing or decreasing the threshold value can make it
easier for OCR software to recognize characters.

If you still have problems...

1. In the EPSON TWAIN Pro main dialog box, try increasing the
Resolution value to 400. Be aware that scanning at higher
resolution takes longer and may not greatly increase the
recognition rate.
2. If you still have problems, try using the enhancement tools in
your OCR software to make adjustments.

Potential text recognition problems

The quality of the text in your original document greatly effects
OCR results.
The following types of originals can make recognition difficult
and should be avoided if possible:
Items that have been copied from other copies
Faxes
Text with tightly-spaced characters or line pitch
Text that is in tables or underlined
Cursive or italic fonts, and font sizes less than 8 points
Remember that most OCR software cannot recognize
handwritten characters.
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Optimizing Scanning