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+unpaper is a post-processing tool for scanned sheets of paper, especially
+for book pages that have been scanned from previously created photocopies.
+The main purpose is to make scanned book pages better readable on screen
+after conversion to PDF. Additionally, unpaper might be useful to enhance
+the quality of scanned pages before performing optical character
+recognition (OCR). unpaper tries to clean scanned images by removing dark
+edges that appeared through scanning or copying on areas outside the actual
+page content (e.g. dark areas between the left-hand-side and the
+right-hand-side of a double- sided book-page scan). The program also tries
+to detect disaligned centering and rotation of pages and will automatically
+straighten each page by rotating it to the correct angle. This process is
+called "deskewing". Note that the automatic processing will sometimes fail.
+It is always a good idea to manually control the results of unpaper and adjust
+the parameter settings according to the requirements of the input. Each
+processing step can also be disabled individually for each sheet. Input and
+output files can be in either .pbm , .pgm or .ppm format, thus generally in
+.pnm format, as also used by the Linux scanning tools scanimage and scanadf.
+Conversion to PDF can e.g. be achieved with the Linux tools pgm2tiff, tiffcp
+and tiff2pdf.