(No version information available, might be only in CVS)
Imagick::contrastImage — Change the contrast of the image
Cette fonction n'est pas documentée et seule la liste des arguments est disponible.
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.
The sharpen value
Returns TRUE on success.
Throws ImagickException on error.