Tsumetogi

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Tsumetogi slices a pdf into images in order to show the differences between current and previous versions on a SCM tool (such as GitHub, BitBucket, etc).

Add this line to your application's Gemfile:

gem 'tsumetogi'

And then execute:

$ bundle

Or install it yourself as:

$ gem install tsumetogi

Tsumetogi uses ImageMagick and Poppler.

On Mac:

$ brew install imagemagick
$ brew install poppler

$ bundle exec tsumetogi scratch pdf_path

Options:

• --config=path: path to a YAML-based config file
• --diff_strategy=[Digest|HighAccuracy|LowMemory]: specifies a strategy name to compare images between current and previous versions
  • Digest: compares images with MD5 digest. It is so fast and low memories, but low accuracy.
  • HighAccuracy: compares images with brightness average values of composed diff images. Its accuracy is high, but it consumes more memories.
  • LowMemory: compares images with brightness average values of composed diff images. Its accuracy is high, but so slow.
• --image-dir=path: path to a directory which will be outputed sliced images (default: <pdf_path>-images)
• --resolution=N: density of sliced images (unit is dpi)
• --crop-x=N, --crop-y=N, --crop-w=N, --crop-h=N: specifies a crop box (unit is cm). (e.g. to crop page numbers in the footer that chages frequently when you add some pages)
• --text, --no-text: outputs a text extracted from the pdf
• --text_path=path: path to a extracted text file (default: <pdf_path>.txt)
• --progress, --no-progress: shows progresses on stdout (default: true)
• --verbose, --no-verbose: shows debug messages on stdout (default: false)

Config file:

You can specifies these options mentioned above with a YAML-based config file.

e.g.

resolution: 72
crop_x: 0
crop_y: 0
crop_w: 209.97 # cm
crop_h: 286.85 # cm
diff_strategy: HighAccuracy

Bug reports and pull requests are welcome on GitHub at https://github.com/devchick/tsumetogi.

The gem is available as open source under the terms of the MIT License.