pub fn unsharpen<I, P, S>(
) -> ImageBuffer<P, Vec<S>> where
I: GenericImage<Pixel = P> + 'static,
P: Pixel<Subpixel = S> + 'static,
S: Primitive + 'static,
Performs an unsharpen mask on the supplied image.
sigma is the amount to blur the image by.
threshold is the threshold for the difference between