Systems and methods for performing optical image processing via a transparent display are disclosed. The resulting sample is subjected through a current-limiting device to a complex 5 waveform including a burst of high-voltage radio-frequency current, which in some embodiments is superimposed on a biphasic high-voltage DC pulse, and in other embodiments on a high-voltage lower-frequency AC burst. The supporting film has retardation characteristics. The pressure controller 134 controls a pressure control valve 130 so as to ensure that the pressure data match preset pressure data. The device may correct for color phase shift and for the dependency of apparent color intensity.