[sane-devel] [ANN] Unpaper - post-processing scanned book-pages
Wed, 02 Mar 2005 16:03:29 +0100
unpaper removes black edges and other photocopy artefacts from scanned
images. It also deskews book pages (auto-rotates them to a straight
alignment), and centers them on the sheet.
Old photocopies can become well-readable PDFs again.
Available at http://unpaper.berlios.de/.
Hope it's useful. Enjoy,
From the Readme:
unpaper is a post-processing tool for scanned sheets of paper,
especially for book pages that have been scanned from previously created
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
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 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 or .pgm 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.
(It's a small program with 1 single source file only. Almost too small
for being an open-source project on its own. If you have ideas to
integrate it into other Linux scanning/graphics projects instead, please
let me know.)