# ScantPaper

A GUI to produce PDFs or DjVus from scanned documents.

Screenshot: Main page v3.0.0

## Usage

1. Start the application with `python3 scantpaper/app.py`. Add `--debug|info|warn|error|fatal` to enable logging at the required level.
2. Scan one or several pages with File → Scan.
3. Create a PDF of selected pages with File → Save.

## Command-line Options

scantpaper supports the following options:

- `--device=<device>`
  Specifies the device to use, instead of getting the list from the SANE API. Useful for remote scanners.

- `--help`
  Displays help and exits.

- `--log=<log-file>`
  Specifies a file to store logging messages.

- `--debug`, `--info`, `--warn`, `--error`, `--fatal`
  Defines the log level. Defaults to `--debug` if a log file is specified, otherwise `--error`.

- `--import=<PDF|DjVu|images>`
  Imports the specified file(s). For multi-page documents, a window is displayed to select required pages.

- `--import-all=<PDF|DjVu|images>`
  Imports all pages of the specified file(s).

- `--version`
  Displays the program version and exits.

Scanning is handled with SANE. PDF conversion uses `img2pdf` and `ocrmypdf`. TIFF export uses `libtiff`.

## Diagnostics

To diagnose errors, start scantpaper from the command line with logging enabled:

    python3 scantpaper/app.py --debug

## Configuration

scantpaper creates a config file at `~/.config/scantpaperrc`. The directory can be changed by setting `$XDG_CONFIG_HOME`. Preferences are usually set via Edit → Preferences.

## Dependencies

### Required

- gir1.2-gdkpixbuf-2.0
- gir1.2-gtk-3.0
- gir1.2-goocanvas-2.0
- imagemagick
- img2pdf
- libtiff-tools
- ocrmypdf
- poppler-utils
- python3-gi
- python3-gi-cairo
- python3-iso639
- python3-pil
- python3-sane
- python3-tesserocr

### Optional

- djvulibre-bin
- unpaper
- xdg-utils

### Development

- pytest-black
- python3-pytest-mock
- python3-pytest-cov
- python3-pytest-pylint
- python3-pytest-timeout
- python3-pytest-xvfb

## Download, Installation & Removal

### Debian-based

- Debian `sid` should automatically have the latest version.

      sudo apt update
      sudo apt install scantpaper

- Ubuntu users can use the PPA:

      sudo apt-add-repository ppa:jeffreyratcliffe/ppa
      sudo apt update
      sudo apt install scantpaper

In either case to remove scantpaper afterwards:

    sudo apt remove scantpaper

### From a wheel file

Download `.whl` from Github.

    # Install the C-libraries that pip cannot handle:
    # For Debian/Ubuntu
    sudo apt update
    sudo apt install libgirepository-2.0-dev libcairo2-dev pkg-config python3-dev gir1.2-glib-2.0
    # For Fedora
    sudo dnf install gobject-introspection-devel cairo-devel pkgconf-pkg-config python3-devel
    # For Arch
    sudo pacman -S gobject-introspection cairo pkgconf python
    # For Homebrew
    brew install pygobject3 gobject-introspection cairo pkg-config
    # Possibly upgrade pip
    python3 -m pip install --upgrade pip
    # Install from the wheel file, automatically including python dependencies
    pip install scantpaper-x.x.x-py3-none-any.whl

If you haven’t already, you will then probably have to add `~/.local/bin` to your path in order to find the new executable, after which you can start it with:

    scantpaper

To then remove it:

    pip uninstall scantpaper

### From Tarball

Download `.tar.gz` from Github.

    tar xvfz scantpaper-x.x.x.tar.gz
    cd scantpaper-x.x.x
    python3 scantpaper/app.py

### From the Repository

Browse the code at Github:

    git clone https://github.com/carygravel/scantpaper.git
    cd scantpaper
    python3 scantpaper/app.py

In either of the above two cases, just delete the source directory to remove it.

## Support

- Mailing lists:
  - gscan2pdf-announce (announcements)
  - gscan2pdf-help (general support)

## Reporting Bugs

- Please read the FAQs first.
- Report bugs preferably against the Debian package or Debian Bugs.
- Alternatively, use the Github issue tracker.
- Include the log file created by `scantpaper --log=log` with your report.

## Translations

gscan2pdf is partly translated into several languages. Contribute via Launchpad Rosetta.

- Scanner option translations come from sane-backends. Contribute via the sane-devel mailing list or SANE project.
- Ubuntu translation project: Jaunty SANE backends

To test updated `.po` files:

    perl Makefile.PL LOCALEDIR=./locale
    perl -I lib bin/gscan2pdf --log=log --locale=locale

Set locale variables as needed (e.g., for Russian):

    LC_ALL=ru_RU.utf8 LC_MESSAGES=ru_RU.utf8 LC_CTYPE=ru_RU.utf8 LANG=ru_RU.utf8 LANGUAGE=ru_RU.utf8 python3 scantpaper/app.py --log=log --locale=locale

## Description

scantpaper provides a GUI for scanning, editing, and saving documents as PDF, DjVu, TIFF, PNG, JPEG, PNM, or GIF. It supports batch scanning, metadata, OCR, and various editing tools.

### Main Features

- Scan: Options for device, page count, source document, side to scan, and device-dependent options (page size, mode, resolution, batch-scan, etc.).
- Save: Save selected/all pages in multiple formats. Supports metadata.
- Email as PDF: Attach pages as PDF to a blank email (requires xdg-email).
- Print: Print selected/all pages.
- Compress temporary files: Compress images to save space.

### Edit Menu

- Delete: Remove selected page.
- Renumber: Renumber pages.
- Select: Select all, even, odd, blank, dark, or modified pages.
- Properties: Edit image metadata.
- Preferences: Configure default behaviors and frontends.

### View Menu

- Pan, Select, Select & Pan tools:
  - Pan: Use the left mouse button to drag the image or canvas to pan the view
  - Select: Use the left mouse button to select a rectangular box
  - Select & Pan: Use the left mouse button to select a rectangular box, and the middle mouse button to drag the image or canvas to pan the view
  - In all of the above, the mouse wheel (middle mouse button) zooms in or out.
- Zoom, rotate, and fit options.

### Tools

- Threshold: Binarize images.
- Unsharp mask: Sharpen images.
- Crop
- unpaper: Clean up scans.
- OCR: Use tesseract to extract text.

#### User-defined Tool Variables

- `%i` - input filename
- `%o` - output filename
- `%r` - resolution

## FAQs

### Why isn’t option xyz available in the scan window?

It may not be supported by SANE or your scanner. If you see it in `scanimage --help` but not in scantpaper, send the output to the maintainer.

### How do I scan a multipage document with a flatbed scanner?

Enable “Allow batch scanning from flatbed” in Preferences. Some scanners require additional settings.

### Why is option xyz ghosted out?

The required package may not be installed (e.g., xdg-email, unpaper, imagemagick).

### Why can I not scan from the flatbed of my HP scanner?

Set “# Pages” to “1” and “Batch scan” to “No”.

### Why is the list of changes not displayed when updating in Ubuntu?

Only changelogs from official Ubuntu builds are shown.

### Why can’t scantpaper find my scanner?

If the scanner is remote and not found automatically, specify the device:

    scantpaper --device <device>

### How can I search for text in the OCR layer?

Use `pdftotext` or `djvutxt` to extract text. Many viewers support searching the embedded text layer.

### How can I change the colour of the selection box or OCR output?

Create or edit `~/.config/gtk-3.0/gtk.css`:

    .rubberband,
    rubberband,
    flowbox rubberband,
    treeview.view rubberband,
    .content-view rubberband,
    .content-view .rubberband {
        border: 1px solid #2a76c6;
        background-color: rgba(42, 118, 198, 0.2);
    }

    #scantpaper-ocr-output {
        color: black;
    }

### What’s in a name?

“scant” (https://en.wiktionary.org/wiki/scant) in this sense means “short (of)”, as I am trying to digitalise my paperwork, and I liked the play on “scan”.

## See Also

- XSane
- Scan Tailor

## History

I started writing `gscan2pdf` as a Perl & Gtk2 project in 2006. Version 2 switched to Gtk3, but kept the basic software architecture. This stored the pages as temporary files with hashed names, which had a couple of major disadvantages:

- Difficult to support PDF/A directly
- It was impossible to create documents with more than a few hundred pages, as it ran out of open file handles.
- In the event of a crash, it was tedious to recreate the document from the image files.
- AFAIK, Perl’s support for Gtk4 never extended beyond that provided by introspection.

Therefore I decided in 2022 to completely rewrite `gscan2pdf` in Python and renamed it for v3 `scantpaper`. The rewrite:

- Supports PDF/A by using `ocrmypdf` to write PDFs
- Stores all session data in a single Sqlite database
- Should be simple to migrate to Gtk4

## Author

Jeffrey Ratcliffe (jffry at posteo dot net)

## Thanks To

- All contributors (patches, translations, bugs, feedback)
- The SANE project
- The authors of `img2pdf` and `ocrmypdf`, without which this would have been much harder.

## Contributing

Contributions are welcome. Please submit pull requests, ensuring that all the tests pass, that new code is covered by new tests, and that the `pylint` does not drop.

To run all the tests, just run `pytest`. To run all the tests in a particular file, `pytest scantpaper/tests/test_app.py`. To run just one test in a file `pytest scantpaper/tests/test_app.py::test_application_init`.

Note that the test suite also tests that the code is formatted with `black`. To fix the formatting `black scantpaper`.

Similarly to check the linting for one or more files `pylint scantpaper/app.py scantpaper/text_layer_control.py`

## License

Copyright © 2006–2026 Jeffrey Ratcliffe jffry@posteo.net

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License v3 as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

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