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(PECL gmagick >= Unknown)
Gmagick::charcoalimage — Simulates a charcoal drawing
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.
错误时抛出 GmagickException。
