(PECL imagick 2.0.0)
Imagick::sketchImage — Simulates a pencil sketch
$radius
, float $sigma
, float $angle
)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. 此方法在Imagick基于ImageMagick 6.2.9以上版本编译时可用。
radius
The radius of the Gaussian, in pixels, not counting the center pixel
sigma
The standard deviation of the Gaussian, in pixels.
angle
Apply the effect along this angle.
成功时返回 TRUE。