Grayscale
=========

Usage: `grayscale()`

Description
-----------

This filter changes the image to grayscale.

Arguments
---------

No arguments.

Example
-------

.. image:: images/tom_before_brightness.jpg
    :alt: Picture before the grayscale filter

::

    http://localhost:8888/unsafe/filters:grayscale()/https%3A%2F%2Fgithub.com%2Fthumbor%2Fthumbor%2Fraw%2Fmaster%2Fexample.jpg

.. image:: images/tom_after_grayscale.jpg
    :alt: Picture after the grayscale filter
