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unpaper

Langue: en

Version: December 31, 2007 (debian - 07/07/09)

Section: 1 (Commandes utilisateur)

NAME

unpaper - post-processing tool for scanned pages

SYNOPSIS

unpaper [options] input-file(s) output-file(s)

DESCRIPTION

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).

OPTIONS

Filenames may contain a formatting placeholder starting with % to insert a page counter for multi-page processing. E.g.: scan%03d.pbm to process files scan001.pbm, scan002.pbm, scan003.pbm etc.

-l, --layout single|double|none
Set default layout options for a sheet:

single: One page per sheet.

double: Two pages per sheet, landscape orientation (one page on the left half, one page on the right half).

none: No auto-layout, mask-scan-points may individually be specified.

Using single or double automatically sets corresponding --mask-scan-points. The default is single.

-start, --start-sheet <sheet>
Number of first sheet to process in multi-sheet mode. (default: 1)
-end, --end-sheet <sheet>
Number of last sheet to process in multi-sheet mode. -1 indicates processing until no more input file with the corresponding page number is available. (default: -1)
-#, --sheet <sheet>{,<sheet>[-<sheet>]}
Optionally specifies which sheets to process in the range between start-sheet and end-sheet.
-x, --exclude <sheet>{,<sheet>[-<sheet>]}
Excludes sheets from processing in the range between start-sheet and end-sheet.
--pre-rotate -90|90
Rotates the whole image clockwise (90) or counter-clockwise (-90) before any other processing.
--post-rotate -90|90
Rotates the whole image clockwise (90) or counter-clockwise (-90) after any other processing.
-M, --pre-mirror [v[ertical]][,][h[orizontal]]
Mirror the image, after possible pre-rotation. Either v (for vertical mirroring), h (for horizontal mirroring) or v,h (for both) can be specified.
--post-mirror [v[ertical]][,][h[orizontal]]
Mirror the image, after any other processing except possible post-rotation.
--pre-shift <h>,<v>
Shift the image before further processing. Values for h (horizontal shift) and v (vertical shift) can either be positive or negative.
--post-shift <h>,<v>
Shift the image after other processing. Values for h (horizontal shift) and v (vertical shift) can either be positive or negative.
--pre-wipe <left>,<top>,<right>,<bottom>
Manually wipe out an area before further processing. Any pixel in a wiped area will be set to white. Multiple areas to be wiped may be specified by multiple occurrences of this options.
--post-wipe <left>,<top>,<right>,<bottom>
Manually wipe out an area after processing. Any pixel in a wiped area will be set to white. Multiple areas to be wiped may be specified by multiple occurrences of this options.
--pre-border <left>,<top>,<right>,<bottom>
Clear the border-area of the sheet before further processing. Any pixel in the border area will be set to white.
--post-border <left>,<top>,<right>,<bottom>
Clear the border-area after processing. Any pixel in the border area will be set to white.
--pre-mask <x1>,<y1>,<x2>,<y2>
Specify masks to apply before any other processing. Any pixel outside a mask will be set to white, unless another mask includes this pixel. Only pixels inside a mask will remain. Multiple masks may be specified. No deskewing will be applied to the masks specified by --pre-mask.
-s, --size <width>,<height>|<size-name>
Change the sheet size before other processing is applied. Content on the sheet gets zoomed to fit to the appropriate size, but the aspect ratio is preserved. Instead, if the sheet's aspect ratio changes, the zoomed content gets centered on the sheet. Size-name can also be a standard name as a4, letter, etc. Possible size names are:

a5
a4
a3
letter
legal

All size names can also be applied in rotated landscape orientation, use a4-landscape, letter-landscape etc.

--post-size <width>,<height>|<name>
Change the sheet size preserving the content's aspect ratio after other processing steps are applied.
--stretch <width>,<height>|<name>
Change the sheet size before other processing is applied. Content on the sheet gets stretched to the specified size, possibly changing the aspect ratio.
--post-stretch <width>,<height>|<name>
Change the sheet size after other processing is applied. Content on the sheet gets stretched to the specified size, possibly changing the aspect ratio.
-z, --zoom <factor>
Change the sheet size according to the given factor before other processing is done.
--post-zoom <factor>
Change the sheet size according to the given factor after processing is done.
-bn, --blackfilter-scan-direction [v[ertical]][,][h[orizontal]]
Directions in which to search for solidly black areas. Either v (for vertical scanning), h (for horizontal scanning) or v,h (for both) can be specified. (default: v,h)
-bs, --blackfilter-scan-size <size>|<h-size>,<v-size>
Width of virtual bar used for mask detection. Two values may be specified to individually set horizontal and vertical size. (default: 20,20)
-bd, --blackfilter-scan-depth <depth>|<h-depth,v-depth>
Size of virtual bar used for black area detection. (default: 500,500)
-bp, --blackfilter-scan-step <step>|<h-step,v-step>
Steps to move virtual bar for black area detection. (default: 5,5)
-bt, --blackfilter-scan-threshold <t>
Ratio of dark pixels above which a black area gets detected. (default: 0.95)
-bx, --blackfilter-scan-exclude <left>,<top>,<right>,<bottom>
Area on which the blackfilter should not operate. This can be useful to prevent the blackfilter from working on inner page content. May be specified multiple times to set more than one area.
-bi, --blackfilter-intensity <i>
Intensity with which to delete black areas. Larger values will leave less noise-pixels around former black areas, but may delete page content. (default: 20)
-ni, --noisefilter-intensity <n>
Intensity with which to delete individual pixels or tiny clusters of pixels. Any cluster which only contains n dark pixels together will be deleted. (default: 4)
-ls, --blurfilter-size <size>|<h-size>,<v-size>
Size of blurfilter area to search for 'lonely' clusters of pixels. (default: 100,100)
-lp, --blurfilter-step <step>|<h-step>,<v-step>
Size of 'blurring' steps in each direction. (default: 50,50)
-li, --blurfilter-intensity <ratio>
Relative intensity with which to delete tiny clusters of pixels. Any blurred area which contains at most the ratio of dark pixels will be cleared. (default: 0.01)
-gs, --grayfilter-size <size>|<h-size>,<v-size>
Size of grayfilter mask to search for 'gray-only' areas of pixels. (default: 50,50)
-gp, --grayfilter-step <step>|<h-step>,<v-step>
Size of steps moving the grayfilter mask in each direction. (default: 20,20)
-gt, --grayfilter-threshold <ratio>
Relative intensity of grayness which is accepted before clearing the grayfilter mask in cases where no black pixel is found in the mask. (default: 0.5)
-p, --mask-scan-point <x>,<y>
Manually set starting point for mask-detection. Multiple --mask-scan-point options may be specified to detect multiple masks.
-m, --mask <x1>,<y1>,<x2>,<y2>
Manually add a mask, in addition to masks automatically detected around the --mask-scan-point coordinates (unless --no-mask-scan is specified). Any pixel outside a mask will be set to white, unless another mask covers this pixel.
-mn, --mask-scan-direction [v[ertical]][,][h[orizontal]]
Directions in which to search for mask borders, starting from --mask-scan-point coordinates. Either v (for vertical scanning), h (for horizontal scanning) or v,h (for both) can be specified. (default: h (v may cut text-paragraphs on single-page sheets))
-ms, --mask-scan-size <size>|<h,v>
Width of the virtual bar used for mask detection. Two values may be specified to individually set horizontal and vertical size. (default: 50,50)
-md, --mask-scan-depth <dep>|<h,v>
Height of the virtual bar used for mask detection. (default: -1,-1, using the total width or height of the sheet)
-mp, --mask-scan-step <step>|<h,v>
Steps to move the virtual bar for mask detection. (default: 5,5)
-mt, --mask-scan-threshold <t>|<h,v>
Ratio of dark pixels below which an edge gets detected, relative to max. blackness when counting from the start coordinate heading towards one edge. (default: 0.1)
-mm, --mask-scan-minimum <w>,<h>
Minimum allowed size of an auto-detected mask. Masks detected below this size will be ignored and set to the size specified by mask-scan-maximum. (default: 100,100)
-mM, --mask-scan-maximum <w>,<h>
Maximum allowed size of an auto-detected mask. Masks detected above this size will be shrunk to the maximum value, each direction individually. (default: sheet size, or page size derived from --layout option)
-mc, --mask-color <color>
Color value with which to wipe out pixels not covered by any mask. Maybe useful for testing in order to visualize the effect of masking. (Note that an RGB-value is expected: R*65536 + G*256 + B)
-dn, --deskew-scan-direction <left>,<top>,<right>,<bottom>
Edges from which to scan for rotation. Each edge of a mask can be used to detect the mask's rotation. If multiple edges are specified, the average value will be used, unless the statistical deviation exceeds --deskew-scan-deviation. Use left for scanning from the left edge, top for scanning from the top edge, right for scanning from the right edge, bottom for scanning from the bottom. Multiple directions can be separated by commas. (default: left,right)
-ds, --deskew-scan-size <pixels>
Size of virtual line for rotation detection. (default: 1500)
-dd, --deskew-scan-depth <ratio>
Amount of dark pixels to accumulate until scanning is stopped, relative to scan-bar size. (default: 0.5)
-dr, --deskew-scan-range <degrees>
Range in which to search for rotation, from -degrees to +degrees rotation. (default: 5.0)
-dp, --deskew-scan-step <degrees>
Steps between single rotation-angle detections. Lower numbers lead to better results but slow down processing. (default: 0.1)
-dv, --deskew-scan-deviation <dev>
Maximum statistical deviation allowed among the results from detected edges. No rotation if exceeded. (default: 1.0)
-W, --wipe <left>,<top>,<right>,<bottom>
Manually wipe out an area. Any pixel in a wiped area will be set to white. Multiple --wipe areas may be specified. This is applied after deskewing and before automatic border-scan.
-mw, --middle-wipe <size>|<left>,<right>
If --layout is set to double, this may specify the size of a middle area to wipe out between the two pages on the sheet. This may be useful if the blackfilter fails to remove some black areas (e.g. resulting from photo-copying in the middle between two pages).
-B, --border <left>,<top>,<right>,<bottom>
Manually add a border. Any pixel in the border area will be set to white. This is applied after deskewing and before automatic border-scan.
-Bn, --border-scan-direction [v[ertical]][,][h[orizontal]]
Directions in which to search for outer border. Either v (for vertical scanning), h (for horizontal scanning) or v,h (for both) can be specified. (default: v)
-Bs, --border-scan-size <size>|<h,v>
Width of virtual bar used for border detection. Two values may be specified to individually set horizontal and vertical size. (default: 5,5)
-Bp, --border-scan-step <step>|<h,v>
Steps to move virtual bar for border detection. (default: 5,5)
-Bt, --border-scan-threshold <t>
Absolute number of dark pixels covered by the border-scan mask above which a border is detected. (default: 5)
-Ba, --border-align <left>,<top>,<right>,<bottom>
Direction where to shift the detected border-area. Use --border-margin to specify horizontal and vertical distances to be kept from the sheet-edge. (default: none)
-Bm, --border-margin <vertical>,<horizontal>
Distance to keep from the sheet edge when aligning a border area. May use measurement suffices such as cm, in.
-w, --white-threshold <threshold>
Brightness ratio above which a pixel is considered white. (default: 0.9)
-b, --black-threshold <threshold>
Brightness ratio below which a pixel is considered black (non-gray). This is used by the gray-filter. This value is also used when converting a grayscale image to black-and-white mode (default: 0.33)
-ip, --input-pages 1|2
If 2 is specified, read two input images instead of one and internally combine them to a doubled-layout sheet before further processing. Before internally combining, --pre-rotation is optionally applied individually to both input images as the very first processing steps.
-op, --output-pages 1|2
If 2 is specified, write two output images instead of one, as a result of splitting a doubled-layout sheet after processing. After splitting the sheet, --post-rotation is optionally applied individually to both output images as the very last processing step.
-S, --sheet-size <width>,<height>|<size-name>
Force a fix sheet size. Usually, the sheet size is determined by the input image size (if input-pages=1), or by the double size of the first page in a two-page input set (if input-pages=2). If the input image is smaller than the size specified here, it will appear centered and surrounded with a white border on the sheet. If the input image is bigger, it will be centered and the edges will be cropped. This option may also be helpful to get regular sized output images if the input image sizes differ. Standard size-names like a4-landscape, letter, etc. may be used (see --size). (default: as in input file)
--sheet-background black|white
Sets a color with which the sheet is filled before any image is loaded and placed onto it. This can be useful when the sheet size and the image size differ.
--no-blackfilter <sheet>{,<sheet>[-<sheet>]}
Disables black area scan. Individual sheet indices can be specified.
--no-noisefilter <sheet>{,<sheet>[-<sheet>]}
Disables the noise filter. Individual sheet indices can be specified.
--no-blurfilter <sheet>{,<sheet>[-<sheet>]}
Disables the blur filter. Individual sheet indices can be specified.
--no-grayfilter <sheet>{,<sheet>[-<sheet>]}
Disables the gray filter. Individual sheet indices can be specified.
--no-mask-scan <sheet>{,<sheet>[-<sheet>]}
Disables mask-detection. Masks explicitly set by --mask will still have effect. Individual sheet indices can be specified.
--no-mask-center <sheet>{,<sheet>[-<sheet>]}
Disables auto-centering of each mask. Auto-centering is performed by default if the --layout option has been set. Individual sheet indices can be specified.
--no-deskew <sheet>{,<sheet>[-<sheet>]}
Disables deskewing. Individual sheet indices can be specified.
--no-wipe <sheet>{,<sheet>[-<sheet>]}
Disables explicit wipe-areas. This means the effect of parameter --wipe can be disabled individually per sheet.
--no-border <sheet>{,<sheet>[-<sheet>]}
Disables explicitly set borders. This means the effect of parameter --border can be disabled individually per sheet.
--no-border-scan <sheet>{,<sheet>[-<sheet>]}
Disables border-scanning from the edges of the sheet. Individual sheet indices can be specified.
--no-border-align <sheet>{,<sheet>[-<sheet>]}
Disables aligning of the area detected by border-scanning (see --border-align). Individual sheet indices can be specified.
-n, --no-processing <sheet>{,<sheet>[-<sheet>]}
Do not perform any processing on a sheet except pre/post rotating and mirroring, and file-depth conversions on saving. This option has the same effect as setting all --no-xxx options together. Individual sheet indices can be specified.
--no-qpixels
Disable qpixel-mode for deskewing (do not internally use a 4x bigger image when rotating).
--no-multi-pages
Disable multi-page processing even if the input filename contains a counter).
--dpi <dpi>
Dots per inch used for conversion of measured size values, like e.g. 21cm,27.9cm. Note that this parameter should occur before specifying any size value with measurement suffix. (default: 300)
-t, --type pbm|pgm
Output file type. (default: as input)
-d, --depth <bits>
Output pixel depth. (default: as input)
-T, --test-only
Do not write any output. May be useful in combination with --verbose to get information about the input.
-in, --input-file-sequence <file-patterns>
Sequence of input filename patterns which is repeatedly traversed while resolving input filenames. Specifying a single entry is equivalent to the first filename argument after the options-list.
-out, --output-file-sequence <file-patterns>
Sequence of output filename patterns which is repeatedly traversed while resolving output filenames. Specifying a single entry is equivalent to the second filename argument after the options-list.
-si, --start-input <nr>
Set the first page number to substitute for %d in input filenames. Every time the input file sequence is repeated, this number gets increased by 1. (default: (startsheet-1)*inputpages+1)
-so, --start-output <nr>
Set the first page number to substitute for %d in output filenames. Every time the output file sequence is repeated, this number gets increased by 1. (default: (startsheet-1)*outputpages+1)
--insert-blank <nr>{,<nr>[-<nr>]}
Use blank input instead of an input file from the input file sequence at the specified index-positions. The input file sequence will be interrupted temporarily and will continue with the next input file afterwards. This can be useful to insert blank content into a sequence of input images.
--replace-blank <nr>{,<nr>[-<nr>]}
Like --insert-blank, but the input images at the specified index positions get replaced with blank content and thus will be ignored.
--overwrite
Allow overwriting existing files. Otherwise the program terminates with an error if an output-file to be written already exists.
-q, --quiet
Quiet mode, no output at all.
-v, --verbose
Verbose output, more info messages.
-vv
Even more verbose output, show parameter settings before processing.
--time
Output processing time consumed.
-V, --version
Output version and build information.

AUTHOR

unpaper was written by Jens Gulden <unpaper@jensgulden.de>.

This manual page was written by Julien BLACHE <jblache@debian.org>, for the Debian project (but may be used by others).

La religion catholique est une méthode pour obtenir le ciel en mendiant.
Mais comme il est trop difficile à obtenir, les prêtres servent
d'entremetteur.
-+- Arthur Schopenhauer -+-