(PECL gmagick >= Unknown)
Gmagick::modulateimage — Control the brightness, saturation, and 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 resulting in a rotation of 180 degrees.
brightnessThe percent change in brighness (-100 thru +100).
saturationThe percent change in saturation (-100 thru +100)
hueThe percent change in hue (-100 thru +100)
The Gmagick object.
错误时抛出 GmagickException。