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Scanning as open book / landscape mode doesn't make it easy to read on tablets and other mobile devices. How many people read a whole book sitting at a PC?
Basic suggestions - getting it (broadly) right involves time and effort:
1. scan routinely at 300dpi, anything less for text than that or absolute minimum of 200dpi (and then only rarely) will make OCR layer fail or be unreliable.
2. scan text in grayscale (or for smaller output file AND if the original book is well printed, in black and white). Reserve color for color originals like covers, illustrations and graphics.
3. if the original book has thin pages that show the text on the reverse side when scanned, insert a black piece of card behind/under the page being scanned. Scanning takes longer but this will render the result far superior.
4. get an edge scanner, often cheaply available on ebay etc, so you can scan near the center binding margin without missing text or damaging the book.
5. only use more than 300dpi if the text is very small and in no event use more than 600dpi as it can confuse OCR.
6. always examine a test page's scan before proceeding. A faded or discolored page can often scan well if the scanner software's own gamma/midrange, contrast and dark/lightness controls are adjusted to suit.
7. to retain ability to clean up scanned images before assembling in pdf or djvu consider scanning to individual files as (uncompressed or packbits or lzh) tif format, or png. After scanning you can then clean up the images to center, align and remove black shade etc in programs like ScanTailor. Check out sites on diy scanners and software.
8. always assemble as a pdf or djvu with the (cleaned up) images in it with a searchable text later underneath them. Adobe Acrobat Professional does this but you can find free (but slightly inferior, OCR-wise) alternatives for MS Windows etc.
9. don't assemble pdf or other output e.g. .doc as OCR only i.e. recognised text without the original page images. OCR and page formatting is still very hit and miss and readers appreciate the look of the original item which is likely to be more memorable than generic text which doesn't retain original fonts or layout.
Also check that all original pages are present and in order and in the correct orientation.
10. use your pdf creating program to optimize the final pdf so its size is reasonable without noticeably compromising image quality.
11. don't get too hung up on the process and suffer workflow block by fretting too much over scanned page image quality. Once you've scanned a few you will easily churn them out to a high standard without wasting time on too much finessing.