The OCR Settings dialog box serves for changing the recognition language and the reject character.
The OCR Settings dialog box appears if you click the 
OCR Settings button beside the Image-only pages selection box in all the four processing modes (Standard Document, Legal, Spreadsheet and Form).
Before PDF conversion starts, you can decide how to handle image-only pages of a PDF file. If you choose Convert Page with OCR, you may want to fine-tune the OCR settings. To achieve the best accuracy, select only the languages your document contains. Multiple language selection is also allowed.
Unrecognizable characters are represented by a reject character which is a tilde ~ by default. You can change this reject character if you wish.
