One `gotcha` when adding new image support libraries and using `Pillow` is that they don't automatically become available for use, you will need to reinstall `Pillow`. But if you have caching enabled it will install the prebuilt version from last time and not search for the system image libraries.

To over come this use:

pip install --no-cache-dir pillow

This will bypass the caching mechanism and perform rebuild all the `Pillow` internals meaning that it will detect the new libraries.

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