In response to light reflected by a manuscript, a latent photo-image corresponding to the manuscript is formed on a photosensitive member comprising photocurable microcapsules containing therein dye precursor reactable to a color developing agent to develop a visible image. The photosensitive member is conveyed from a supply source, via a light exposure platform, to a developing section in an imaging device, while effectively protected from ambient light. When a transfer member is used to pass through the developing section, together with the photosensitive member, a separator lug is provided for separating the transfer member from the photosensitive member immediately after passing through the developing section. The exposure platform has a surface of an excellent light-absorptive material to prevent the recording sheet from being exposed again to light reflected from the platform surface.