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