144dpi is only going to work well with larger print books with very clean pages (read: modern fiction will usually work well at this DPI). You get into some of the older, smaller print stuff and 144 dpi is going to fail miserably and at times spectacularly. 300 dpi is the happy medium in most cases. Above that, stray marks on the paper can be misinterpreted at times by the OCR process. However, on some fairly small print books, 600dpi has been necessary. Josh ----- Original Message ----- From: "Keith J . Schultz" <schultzk@uni-trier.de>
Hi,
I have to see what my canon 20D will do in BW-mode. But far as resolution goes and OCR, you do not want to go any higher than 300 Dpi, because above 300 dpi the OCR starts to see the structure of the paper and makes mistakes. This is even more important with older books. Try just using 144 dpi this should give you the same results as 300 dpi.
Keith.