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bool Imagick::sharpenImage ( float radius, float sigma [, int channel] )

This function is currently not documented; only the argument list is available.

This function is
*EXPERIMENTAL*. The behaviour of this function, the
name of this function, and anything else documented about this
function may change without notice in a future release of PHP.
Use this function at your own risk.

Sharpens an image. We convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, the radius should be larger than sigma. Use a radius of 0 and selects a suitable radius for you.

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