A tone reproduction operator accounting for mesopic vision

Abstract

High dynamic range (HDR) imaging provides more physically accurate measurements of pixel intensities, but displaying them may require tone mapping as the dynamic range between image and display device can differ. Most tone-mapping operators (TMO) focus on luminance compression ignoring chromatic assets. The human visual system (HVS), however, alters color perception according to the level of luminosity. At photopic conditions color perception is accurate and as conditions shift to scotopic, color perception decreases. Mesopic vision is a range in between where colors are perceived but in a distorted way: red intensities' responses fade faster producing a blue-shift effect known as Purkinje effect.