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 sharpen selects a suitable radius for you.
The radius of the Gaussian in pixels, not counting the center pixel.
The standard deviation of the Laplacian, in pixels.
If no channels are specified, sharpens all the channels.
See Implementation
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 sharpen selects a suitable radius for you.