The color imaging capacity of recently developed perovskite photodetectors (PDs) has not been fully explored. In this Letter, we fabricate a CH3NH3PbI3 (MAPbI(3)) PD as a color imaging sensor mainly due to its almost flat spectral response in a full visible light region. To enhance the photodetection performance, we introduce a dual functional interfacial TiO2 layer by atomic layer deposition, reducing the dark current to 12 pA from 13 nA and improving the photocurrent to 1.87 mu A from 20 nA, resulting in a similar to 10(5) fold enhancement of the ON/OFF ratio. Since we obtained satisfactory color images, we believe that the MAPbI(3) perovskite PD is an ideal photosensitive device for color imaging. (C) 2020 Optical Society of America