The radius of the Gaussian operator.
The standard deviation of the Gaussian operator.
The percentage of the blurred image to be added to the receiver, specified as a fraction between 0 and 1.0. A good starting value is 1.0
The threshold needed to apply the amount, specified as a fraction between 0 and 1.0.
The channels to sharpen.
Sharpens an image. We convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and unsharpMask selects a suitable radius for you.