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Optimizing images
=================
Aside from the basic optimizations that the Pillow backend provides, Willow supports using dedicated libraries to
optimize images. Out of the box, Willow comes with optimizers for `gifsicle <https://www.lcdf.org/gifsicle/>`_,
`jpegoptim <https://www.kokkonen.net/tjko/projects.html>`_, `optipng <https://optipng.sourceforge.net/>`_,
`pngquant <https://pngquant.org/>`_ and `cwebp <https://developers.google.com/speed/webp/docs/cwebp>`_.
They can be enabled by setting the ``WILLOW_OPTIMIZERS`` environment variable to ``true``. To enable a specific
subset of optimizers, set the ``WILLOW_OPTIMIZERS`` environment variable to a comma-separated list of their
library names. For example, to enable only ``jpegoptim`` and ``optipng``:
.. code-block:: ini
WILLOW_OPTIMIZERS=jpegoptim,optipng
or if using Django:
.. code-block:: python
WILLOW_OPTIMIZERS = "jpegoptim,optipng"
# or as a list of optimizer library names
WILLOW_OPTIMIZERS = ["jpegoptim", "optipng"]
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