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Upscale
=======
Usage: `upscale()`
Description
-----------
This filter tells thumbor to upscale your images. This only makes sense with
"fit-in" or "adaptive-fit-in".
This means that if an original image is :math:`300px` width by :math:`200px` height and you
ask for a :math:`600x500` image, the filter will resize it to :math:`600x400`.
Arguments
---------
No arguments allowed.
Example
-------
::
http://localhost:8888/unsafe/fit-in/600x500/filters:upscale()/https://raw.githubusercontent.com/thumbor/thumbor/e86324e49d7e53acc2a8057e43f3fdd2ca5cea75/docs/images/dice_transparent_background.png
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