(PECL imagick 2.0.0)
Imagick::sharpenImage — Sharpens an image
This function is currently not documented; only its argument list is available.
Sharpens an image. We convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, the radius should be larger than sigma. Use a radius of 0 and selects a suitable radius for you.
Returns TRUE on success.