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native MagickImage magick::MagickImage::charcoalImage ( double  raduis,
double  sigma 
) throws MagickException

Creates a new image that is a copy of an existing one with the edges highlighted, producing a 'charcoal-drawing' effect.

raduis The radius of the pixel neighborhood.
sigma The standard deviation of the gaussian, in pixels
A charcoal-like image.
MagickException on error

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