(PECL imagick 2.0.0)
Control the brightness, saturation, and hue
bool Imagick::modulateImage ( float $brightness, float $saturation, float $hue )
Lets you control the brightness, saturation, and hue of an image. Hue is the percentage of absolute rotation from the current position. For example 50 results in a counter-clockwise rotation of 90 degrees, 150 results in a clockwise rotation of 90 degrees, with 0 and 200 both resul