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. Available since 6.2.9
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Image
Radius
Sigma
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. Available since 6.2.9
Parameters
radiusfloatThe radius of the Gaussian, in pixels, not counting the center pixel
sigmafloatThe standard deviation of the Gaussian, in pixels.
anglefloatApply the effect along this angle.
function sketchImage($imagePath, $radius, $sigma, $angle)
{
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->sketchimage($radius, $sigma, $angle);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}