An image is formed by projecting an image by way of an image irradiating device onto an image bearing member configured to operate at a linear velocity of at least 300 mm/sec, and which is constructed of(i) an electroconductive substrate having an image bearing surface that has an established surface charge having an electric field intensity of at least 32.1 V/.mu.m which is defined as the ratio of the absolute value (V) of the surface voltage of a non-irradiated portion of the image bearing member at a developing position to the layer thickness of the photosensitive layer (.mu.m), (ii) a charge blocking layer overlying the electroconductive substrate, (iii) a moire prevention layer overlying the charge blocking layer and (iv) a photosensitive layer overlying the moire prevention layer consisting essentially of a titanyl phthalocyanine; charging the image bearing member by means of a charging device; irradiating said surface of the image bearing member with plural irradiation beams; developing the latent electrostatic image with a developing device; transferring the developed image by a transfer device configured; and cleaning the image bearing member.