unsharpen
=========

Goal:
-----
Unsharpen the input image up to a threshold.

Syntax:
-------
`unsharpen <fp> <int>`

where <fp> means: any 32 bit floating point number is required as parameter input.
and <int> means: any 32 bit signed integer is required as parameter input.

The first argument (<fp>) decides how much the image is blurred, and the second argument (<int>) defines the threshold of how much the image will be sharpened.

Usage example:
--------------
`sic input.png output.png --script "unsharpen 10 5;"`
or `sic input.png output.png --script "unsharpen 0.8 3;"`


See also:
---------
https://docs.rs/image/0.19.0/image/imageops/fn.unsharpen.html
https://en.wikipedia.org/wiki/Unsharp_masking#Digital_unsharp_masking

