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any tips on plugging-in any 3rd party image processing filters? Maybe I looked in the wrong place, but could only see storage plugins on the wiki.

For example, we have a ruby-based library for converting images for different types of colour-blindness[0]. It's available from ruby, or via the command line. How could we use it as a filter in thumbor?

[0] https://github.com/kenhub/shikimo

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It can be easily implemented as a filter[1][2]. If you need to use it via command-line you can save the current buffer as a tempfile[3], call your CLI with the tempfile path and read the tempfile to use as the new buffer.

It's even simpler if your CLI can take a stdin argument, since you can just pass the buffer as a stdin parameter.

Thumbor's filter infrastructure allows you to change the image incrementally.

[1] https://github.com/thumbor/thumbor/wiki/Brightness

[2] https://github.com/thumbor/thumbor/blob/master/thumbor/filte...

[3] https://docs.python.org/2/library/tempfile.html

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