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diff --git a/graphics/unpaper/README b/graphics/unpaper/README new file mode 100644 index 0000000000..3a19caed4d --- /dev/null +++ b/graphics/unpaper/README @@ -0,0 +1,19 @@ +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. |