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A large area colour imager optically addressed is presented. The colour imager consists of a thin wide band gap p-i-n a-SiC:H filtering element deposited on the top of a thick large area a-SiC:H(-p)/a-Si:H(-i)/SiC:H(-n) image sensor, which reveals an intrinsic colour filter. In order to tune the external applied voltage for full colour discrimination, the photocurrent generated by a modulated red light is measured under different optical and electrical bias. Results show that the device, under appropriated readout voltages, behaves itself as an imager and a filter giving information not only on the position where the optical image is absorbed but also on its wavelength and intensity. Identification of the red, green and blue components of the spectrum and simultaneous image recognition were achieved at readout voltages that are able to cancel the self-bias effect due to the different light penetration depth. These voltages shift …