Libtiff.info CLI : "ValueError: 'gtkagg' is not a valid value for backend" .

[dennis-glx]

Hi,

When trying to use the libtiff.info script, I got the following error.

$ libtiff.info -i my_image.tiff --no-gui

Traceback (most recent call last):
  File "/home/dj/.local/bin/libtiff.info", line 8, in <module>
    sys.exit(main())
  File "/home/dj/.local/lib/python3.8/site-packages/libtiff/scripts/info.py", line 77, in main
    set_info_options(parser)
  File "/home/dj/.local/lib/python3.8/site-packages/libtiff/script_options.py", line 95, in set_info_options
    matplotlib.use('GTkAgg')
  File "/home/dj/.local/lib/python3.8/site-packages/matplotlib/__init__.py", line 1154, in use
    name = validate_backend(backend)
  File "/home/dj/.local/lib/python3.8/site-packages/matplotlib/rcsetup.py", line 295, in validate_backend
    else _validate_standard_backends(s))
  File "/home/dj/.local/lib/python3.8/site-packages/matplotlib/rcsetup.py", line 81, in __call__
    raise ValueError(msg)
ValueError: 'gtkagg' is not a valid value for backend; supported values are ['GTK3Agg', 'GTK3Cairo', 'MacOSX', 'nbAgg', 'Qt4Agg', 'Qt4Cairo', 'Qt5Agg', 'Qt5Cairo', 'TkAgg', 'TkCairo', 'WebAgg', 'WX', 'WXAgg', 'WXCairo', 'agg', 'cairo', 'pdf', 'pgf', 'ps', 'svg', 'template']

Platform & Versions

• Package Version : pylibtiff==0.6.0, tried with v0.5.1 too.
• Python Version : 3.8.10
• Ubuntu 20.04 aarch64

Workaround

This edit in lib/python3.8/site-packages/libtiff/script_options.py allows my intended use. I noticed that "--no-gui" flag is not a valid command line option. Perhaps the documentation can be updated.

 95             matplotlib.use('GTk3Agg')

[dennis-glx]

Fixed in #166. Closing.