I've been doing some local history research which has involved printing out various newspaper articles held on library film. Some of these images are quite dark and scanning the prints prior to OCR'ing them has resulted in black 'text' on a relatively dark grey background. The resultant OCR'd text files are at best full of errors. I'm looking for a way of enhancing the contrast of the scanned images to improve the accuracy of the OCR process. Any ideas??
Thanks for the reply. The newspapers I'm copying are stored on film, so I cannot physically adjust the image result by inserting dark card. I can obtain a print out of these film images but to lighten the background often adversely affects the boldness and readability of the text. Experience to date confirms that greyscale scans of the printouts are superior to black/white, but that colour scans are even better.