The invention relates to a process for forming a structure comprising: (a) providing a transparent support; (b) forming a color mask having a selected absorption spectral range wherein the color mask has an effectively transparent portion and a partially absorptive portion, wherein the partially absorptive portion includes at least two portions having different optical densities within the absorption spectral range; (c) coating a layer of a photopatternable material sensitive to visible light in the absorption spectral range; (d) exposing and developing the photopatternable material to form a photopattern corresponding to at least one of said two portions of the partially absorptive portion; and (e) depositing and patterning a layer of functional material such that a pattern of functional material results corresponding to the at least one of said two portions of the partially absorptive portion.