(PECL gmagick >= Unknown)
Gmagick::charcoalimage — Simulates a charcoal drawing
public Gmagick::charcoalimage ( float $radius , float $sigma ) : Gmagick
Simulates a charcoal drawing.
radius
The radius of the Gaussian, in pixels, not counting the center pixel
sigma
The standard deviation of the Gaussian, in pixels
The Gmagick object with charcoal simulation
Throws an GmagickException on error.
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https://www.php.net/manual/en/gmagick.charcoalimage.php