Utilization of non-printing high-spatial-frequency auxiliary pixels are introduced into the bitmap of an image to obtain local control of the image development by modification of local average voltage in the development nip. The compounds are inhibitors of \u03b2-amyloid peptide production and are useful in the treatment of Alzheimer’s Disease and other conditions characterized by aberrant extracellular deposition of amyloid. A set of kinoforms diffract the angularly modulated beam into a bundle of diffracted beams. In contrast, ancillary data are data that have an additional utility.