Unsharp mask filter for iPad

Hi friends,

               I am trying to apply USM filter on the image (taking from the server). but i am not getting any help in apple document. I searched in google and i got GPUIimage and imagemagick open source library. but in imagemagick it seems USM filter is not working and in GPUIimage, i am not getting how it will take image as input which i am taking from the server .

               please guide me.

 

Thanks

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