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