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![GitHub release (latest by date)](https://img.shields.io/github/v/release/ImageProcessing-ElectronicPublications/unpaper) | ||
![GitHub Release Date](https://img.shields.io/github/release-date/ImageProcessing-ElectronicPublications/unpaper) | ||
![GitHub repo size](https://img.shields.io/github/repo-size/ImageProcessing-ElectronicPublications/unpaper) | ||
![GitHub all releases](https://img.shields.io/github/downloads/ImageProcessing-ElectronicPublications/unpaper/total) | ||
![GitHub](https://img.shields.io/github/license/ImageProcessing-ElectronicPublications/unpaper) | ||
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# unpaper | ||
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Originally written by Jens Gulden — see [AUTHORS](AUTHORS) for more information. | ||
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## Overview | ||
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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). | ||
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`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). | ||
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The program also tries to detect misaligned centering and rotation of pages | ||
and will automatically straighten each page by rotating it to the correct | ||
angle. This process is called "deskewing". | ||
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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. | ||
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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`. | ||
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Conversion to PDF can e.g. be achieved with the Linux tools `pgm2tiff`, `tiffcp` | ||
and `tiff2pdf`. | ||
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## LICENSE | ||
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Licensed under GNU GPL v2 — see [COPYING](COPYING) for more information. |
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