(PECL imagick 2.0.0)
Imagick::shadeImage — Creates a 3D effect
$gray
   , float $azimuth
   , float $elevation
   )Shines a distant light on an image to create a three-dimensional effect. You control the positioning of the light with azimuth and elevation; azimuth is measured in degrees off the x axis and elevation is measured in pixels above the Z axis. 此方法在Imagick基于ImageMagick 6.2.9以上版本编译时可用。
gray
     A value other than zero shades the intensity of each pixel.
azimuth
     Defines the light source direction.
elevation
     Defines the light source direction.
   成功时返回 TRUE .