URL
http://api.imgble.com/unsharp-mask|<a>|<r>|<t>/http://mydomain.com/myimage.jpg

Parameters
<a> is the amount (default = 80)
<r> is the radius (default = 0.5)
<t> is the threshold (default = 3)

Example
http://api.imgble.com/unsharp-mask|50|0.5|4/http://farm1.static.flickr.com/57/197881059_aeb724b1cf.jpg

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