ImageMagick Dependency and Colab Error

[Zifan]

Hi here,

I got the same error as #7 when checking a Overleaf generated pdf file on macOS Monterey 12.2.1:

Traceback (most recent call last):
  File "/Users/zifanjiang/opt/anaconda3/lib/python3.9/site-packages/wand/api.py", line 151, in <module>
    libraries = load_library()
  File "/Users/zifanjiang/opt/anaconda3/lib/python3.9/site-packages/wand/api.py", line 140, in load_library
    raise IOError('cannot find library; tried paths: ' + repr(tried_paths))
OSError: cannot find library; tried paths: []

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/zifanjiang/workspace/aclpubcheck/aclpubcheck/formatchecker.py", line 494, in <module>
    main()
  File "/Users/zifanjiang/workspace/aclpubcheck/aclpubcheck/formatchecker.py", line 491, in main
    worker(submission, args.paper_type)
  File "/Users/zifanjiang/workspace/aclpubcheck/aclpubcheck/formatchecker.py", line 454, in worker
    return Formatter().format_check(submission=pdf_path, paper_type=paper_type)
  File "/Users/zifanjiang/workspace/aclpubcheck/aclpubcheck/formatchecker.py", line 80, in format_check
    self.check_page_margin(output_dir)
  File "/Users/zifanjiang/workspace/aclpubcheck/aclpubcheck/formatchecker.py", line 284, in check_page_margin
    im = self.pdf.pages[page].to_image(resolution=150)
  File "/Users/zifanjiang/opt/anaconda3/lib/python3.9/site-packages/pdfplumber/page.py", line 356, in to_image
    from .display import DEFAULT_RESOLUTION, PageImage
  File "/Users/zifanjiang/opt/anaconda3/lib/python3.9/site-packages/pdfplumber/display.py", line 6, in <module>
    from wand.image import Color as WandColor  # type: ignore
  File "/Users/zifanjiang/opt/anaconda3/lib/python3.9/site-packages/wand/image.py", line 18, in <module>
    from . import assertions
  File "/Users/zifanjiang/opt/anaconda3/lib/python3.9/site-packages/wand/assertions.py", line 155, in <module>
    from .color import Color  # noqa: E402
  File "/Users/zifanjiang/opt/anaconda3/lib/python3.9/site-packages/wand/color.py", line 10, in <module>
    from .api import library
  File "/Users/zifanjiang/opt/anaconda3/lib/python3.9/site-packages/wand/api.py", line 175, in <module>
    raise ImportError('MagickWand shared library not found.\n'
ImportError: MagickWand shared library not found.
You probably had not installed ImageMagick library.
Try to install:
  brew install freetype imagemagick

And still got the same error after either brew install freetype imagemagick or brew install imagemagick@6. So I assume this issue is not solved (for my environment).

Then I also tried to use Colab https://colab.research.google.com/drive/1Sq6ilmrFUQpUFMkV71U8-Wf0madW-Uer?usp=sharing.

I got another problem there: FileNotFoundError: [Errno 2] No such file or directory: '/etc/ImageMagick-6/policy.xml', which I can overcome by first mkdir /etc/ImageMagick-6/ and then running the code.

Then I got a similar error:

Checking paper.pdf
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/dist-packages/wand/api.py", line 151, in <module>
    libraries = load_library()
  File "/usr/local/lib/python3.7/dist-packages/wand/api.py", line 140, in load_library
    raise IOError('cannot find library; tried paths: ' + repr(tried_paths))
OSError: cannot find library; tried paths: []

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "aclpubcheck-main/aclpubcheck/formatchecker.py", line 494, in <module>
    main()
  File "aclpubcheck-main/aclpubcheck/formatchecker.py", line 491, in main
    worker(submission, args.paper_type)
  File "aclpubcheck-main/aclpubcheck/formatchecker.py", line 454, in worker
    return Formatter().format_check(submission=pdf_path, paper_type=paper_type)
  File "aclpubcheck-main/aclpubcheck/formatchecker.py", line 80, in format_check
    self.check_page_margin(output_dir)
  File "aclpubcheck-main/aclpubcheck/formatchecker.py", line 284, in check_page_margin
    im = self.pdf.pages[page].to_image(resolution=150)
  File "/usr/local/lib/python3.7/dist-packages/pdfplumber/page.py", line 356, in to_image
    from .display import DEFAULT_RESOLUTION, PageImage
  File "/usr/local/lib/python3.7/dist-packages/pdfplumber/display.py", line 6, in <module>
    from wand.image import Color as WandColor  # type: ignore
  File "/usr/local/lib/python3.7/dist-packages/wand/image.py", line 18, in <module>
    from . import assertions
  File "/usr/local/lib/python3.7/dist-packages/wand/assertions.py", line 155, in <module>
    from .color import Color  # noqa: E402
  File "/usr/local/lib/python3.7/dist-packages/wand/color.py", line 10, in <module>
    from .api import library
  File "/usr/local/lib/python3.7/dist-packages/wand/api.py", line 177, in <module>
    'Try to install:\n  ' + msg)
ImportError: MagickWand shared library not found.
You probably had not installed ImageMagick library.
Try to install:
  apt-get install libmagickwand-dev

I have attached a pdf file that got the error:

EMNLP_2022_Template.pdf

[Danilo Croce]

Unfortunately, this seems to be a problem at colab.

The Ubuntu they are using has a broken link to libmagickwand-dev

I had to change it to a manual install.
I really hope that they quickly solve it.

However, it should now work, at least in colab.
Can you confirm it?

[Zifan]

Yes it works, thank you very much!