// Adjusts the canvas's brightness given a factor (-1.0 thru 1.0)
func (self *Canvas) SetBrightness(factor float64) error {
factor = math.Max(-1, factor)
factor = math.Min(1, factor)
success := C.MagickModulateImage(self.wand, C.double(100+factor*100.0), C.double(100), C.double(100))
if success == C.MagickFalse {
return fmt.Errorf("Could not set brightness: %s", self.Error())
}
return nil
}
// Adjusts the canvas's hue given a factor (-1.0 thru 1.0)
func (cv Canvas) SetHue(factor float64) bool {
factor = math.Max(-1, factor)
factor = math.Min(1, factor)
status := C.MagickModulateImage(cv.wand, C.double(100), C.double(100), C.double(100+factor*100.0))
if status == C.MagickFalse {
return false
}
return true
}