ABSTRACT
Visual information designers and researchers must sometimes specify predict, or control the luminance and chromaticity of self-luminous display. (Luminance is a measure of radiant energy, weighted according to its visibility for humans. The preferred units are candelas per m2 (cd/m2), as specified in the Standard International (SI) notational system, but foot-Lamberts (fL), from the English system are still used sometimes; chromaticity is used to refer to those psychophysical measures of color that are independent of luminance.) Accurate image representation can be very important because the human visual system responds differently to different levels of light intensity color, size, duration and other factors. Visual information designers attempt to exploit visual system characteristics through appropriate manipulation of light. For an information display design to produce a desired response consistent with population stereotypes, for example, or to avoid an undesired response such as a perceptual artifact, a display image’s luminance and chromaticity may have to meet certain specifications.
