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            "Programming Language :: Python :: 3",
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        "description": "\n***************************************************************\n``diff-pdf-visually``: Find visual differences between two PDFs\n***************************************************************\n\n.. image:: https://img.shields.io/pypi/v/diff-pdf-visually.svg\n    :target: https://pypi.python.org/pypi/diff-pdf-visually/\n\n.. image:: https://img.shields.io/pypi/l/diff-pdf-visually.svg\n    :target: https://pypi.python.org/pypi/diff-pdf-visually/\n\nThis script checks whether two PDFs are visually the same. So:\n\n- White text on a white background will be **ignored**.\n- Subtle changes in position, size, or color of text will be **detected**.\n- This program will ignore changes caused by a different version of the PDF generator, or by invisible changes in the source document.\n\nThis is in contrast to most other tools, which tend to extract the text stream out of a PDF, and then diff those texts. Such tools include:\n\n- `pdf-diff <https://github.com/JoshData/pdf-diff>`_ by Joshua Tauberer\n\nThere seem to be some tools similar to the one you're looking at now, although I have experience with none of these:\n\n- V\u00e1clav Slav\u00edk seems to have `an open source one <https://github.com/vslavik/diff-pdf>`_\n- There might be more useful ones mentioned on `this SuperUser thread <https://superuser.com/questions/46123/how-to-compare-the-differences-between-two-pdf-files-on-windows>`_\n\nThe strength of this script is that it's simple to use on the command line, and it's easy to reuse in scripts:\n\n.. code-block:: python\n\n    from diff_pdf_visually import pdfdiff\n\n    # Returns True or False\n    pdfdiff(\"a.pdf\", \"b.pdf\")\n\nOr use it from the command line:\n\n.. code-block:: shell\n\n    $ pip3 install --user diff-pdf-visually\n    $ diff-pdf-visually a.pdf b.pdf\n\nHow it works\n============\n\nWe use ``pdftocairo`` to convert both PDFs to a series of PNG images in a temporary directory. The number of pages and the dimensions of the page must be exactly the same. Then we call ``compare`` from ImageMagick to check how similar they are; if one of the pages compares different above a certain threshold, then the PDFs are reported as different, otherwise they are reported the same.\n\n**You must have ImageMagick and pdftocairo already installed**.\n\nCall ``diff-pdf-visually`` without parameters (or run ``python3 -m diff_pdf_visually``) to see its command line arguments. Import it as ``diff_pdf_visually`` to use its functions from Python.\n\nThere are some options that you can use either from the command line or from Python::\n\n    $ diff-pdf-visually  -h\n    usage: diff-pdf-visually [-h] [--silent] [--verbose] [--threshold THRESHOLD]\n                             [--dpi DPI] [--time TIME]\n                             a.pdf b.pdf\n\n    Compare two PDFs visually. The exit code is 0 if they are the same, and 2 if\n    there are significant differences.\n\n    positional arguments:\n      a.pdf\n      b.pdf\n\n    optional arguments:\n      -h, --help            show this help message and exit\n      --silent, -q          silence output (can be used only once)\n      --verbose, -v         show more information (can be used 2 times)\n      --threshold THRESHOLD\n                            PSNR threshold to consider a change significant,\n                            higher is more sensitive (default: 100)\n      --dpi DPI             resolution for the rasterised files (default: 50)\n      --time TIME           number of seconds to wait before discarding temporary\n                            files, or 0 to immediately discard (hint: use -v)\n\nThese \"temporary files\" include a PNG image of where any differences are, per page, as well as the log output of ImageMagick. If you want to get a feeling for thresholds, there are some example PDFs in the ``tests/`` directory.\n\nSo what do you use this for?\n============================\n\nPersonally, I've used this a couple of times to refactor my LaTeX documents: I just simplify or remove some macro definitions, and if nothing changes, apparently it's safe to make that change.\n\nHow to install this\n===================\n\n``pip3 install diff-pdf-visually``\n\nStatus\n======\n\nAt the moment, this program/module works best for finding *whether* two PDFs are visually different.\n\nThis project is licenced under the MIT licence. It does not work on Python 2, but patches are welcome if they are not too invasive.\n\n",
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