(PECL gmagick >= Unknown)
Gmagick::charcoalimage — Simulates a charcoal drawing
public Gmagick::charcoalimage(float $radius, float $sigma): Gmagick
Simulates a charcoal drawing.
radiusThe radius of the Gaussian, in pixels, not counting the center pixel.
sigmaThe 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