* blackwhite subcommand to convert color images to black and white; incl. doc * frame subcommand to put a monocolor frame around images; incl. tests
0.4.0
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* convert RGBA mode PNG images to RGB (to enable saving as JPG) * crop subcommand to crop images to a specified aspect ratio * documentation for colorfix and crop
0.3.0
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* :code:`-d/--digits` option to specify number of digits in file names * :code:`-c/--increment` option to define increment for file numbering * create non-existing output folder instead of complaining
0.2.0
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* no-op save command for only saving images * raise exception if output image already exists * :code:`-f/--force-overwrite` flag to enable overwriting output * tests for cli, pipeline and resize