(PECL imagick 2.0.0)
Imagick::contrastImage — Change the contrast of the image
$sharpen
)Enhances the intensity differences between the lighter and darker elements of the image. Set sharpen to a value other than 0 to increase the image contrast otherwise the contrast is reduced.
sharpen
The sharpen value
Restituisce TRUE
in caso di successo.
Lancia una ImagickException in caso di errore.