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Contrast
========
Usage: `contrast(amount)`
Description
-----------
This filter increases or decreases the image contrast.
Arguments
---------
- ``amount`` - :math:`-100` to :math:`100` - The amount (in %) to change the image contrast. Positive numbers increase contrast and negative numbers decrease contrast.
Example
-------
.. image:: images/tom_before_brightness.jpg
:alt: Picture before the contrast filter
::
http://localhost:8888/unsafe/filters:contrast(40)/https%3A%2F%2Fgithub.com%2Fthumbor%2Fthumbor%2Fraw%2Fmaster%2Fexample.jpg
.. image:: images/tom_after_positive_contrast.jpg
:alt: Picture after positive contrast
::
http://localhost:8888/unsafe/filters:contrast(-40)/https%3A%2F%2Fgithub.com%2Fthumbor%2Fthumbor%2Fraw%2Fmaster%2Fexample.jpg
.. image:: images/tom_after_negative_contrast.jpg
:alt: Picture after negative contrast
|
