Fujitsu ScanSnap S510 Operator's Manual page 221

6.2 Using Adobe Acrobat
⇒
Textual information is added to the text images via OCR.
To text recognize the images of color documents, select "Better (Faster)" or
HINT
"Best (Slow)" in the "Image quality" drop-down list on the [Scanning] tab of the
"ScanSnap Manager - Scan and Save Settings" dialog box (page 78).
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ScanSnap S510 Operator's Guide