An image processing apparatus prints an image without streaks on a medium. The body includes first and second body parts spaced apart from each other. An enhancement mode transistor device InGaP etch stopSchottky contact layer is disposed over the channel layer; a first layer different from InGaP disposed on the InGaP layer; a depletion mode transistor device etch stop layer is disposed on the first layer; and a second layer disposed on the depletion mode transistor device etch stop layer.