(No version information available, might be only in CVS)
Imagick::sketchImage — Simulates a pencil sketch
This function is currently not documented; only its argument list is available.
Simulates a pencil sketch. 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 Imagick::sketchImage() selects a suitable radius for you. Angle gives the angle of the blurring motion.
Returns TRUE on success.