Appearance Modelling

When images are displayed in different media, the viewing conditions are often different. This means that conventional colorimetry is an inadequate basis for comparing the images. Models of color vision have therefore been devised that take account of the effects of many of the viewing conditions. The models can then be used to predict the appearances of colors displayed in different media; criteria for equality of appearance can then be determined, and differences in appearance evaluated in a meaningful way. One such model is described. Its predictions for samples, seen by reflection, by projection, and by display on television-type monitors, are reviewed and discussed.