code: func (c *ColorM) ChangeHSV(hueTheta float64, saturationScale float64, valueScale float64) {
  	c.impl = c.impl.ChangeHSV(hueTheta, float32(saturationScale), float32(valueScale))
  }
docs: // ChangeHSV changes HSV (Hue-Saturation-Value) values.
  // hueTheta is a radian value to rotate hue.
  // saturationScale is a value to scale saturation.
  // valueScale is a value to scale value (a.k.a. brightness).
  //
  // This conversion uses RGB to/from YCrCb conversion.