Proceedings Article | 29 January 2007
KEYWORDS: Visualization, Data modeling, LCDs, Colorimetry, Plasma display panels, CRTs, Lamps, Performance modeling, Visual process modeling, Photography
This paper describes an investigation into the effect of a wide range of surround conditions on the colour appearance of
test colours on a 42" plasma display panel. Experiments were conducted using surrounds including dark, indoor and
outdoor conditions. Additionally the stimulus size was changed by controlling the viewing distance. The viewing
conditions studied were two bright, two average, two dim and two dark surrounds. Each of the test colours was assessed
by 10 observers using a magnitude estimation method. These surrounds were divided into two categories. In the first
category, the surround had no effect on the displayed colours, but observers could still sense the different brightness
levels of the surround. In the second category, surround introduced flare to the displayed colours together. For the first
category, little visual lightness difference was shown between bright and dark, and dim and dark surround, unlike the
expectation that the perceived lightness contrast may increase as the surround becomes brighter. The lightness
dependency of colourfulness, however, was found to change. For the second category, the visual colour appearance of
the surround conditions was plotted against measured data, CIELAB L*, C* values, to try to understand the surround
effect. As the surround became brighter, the perceived dynamic range of visual lightness decreased, and the perceived
colourfulness increased, more obviously in high chroma colours. In the investigation of the change of stimulus size
under different surround conditions, visual colour appearance was not affected by the stimulus sizes of 2o and 0.6o in the
dark surround. However, the difference was found in the very dark colours with a dim surround. Finally, all of visual
colour appearance data were used to test the performance of the colour appearance model CIECAM02. Minor
modification was accomplished to improve the colourfulness predictor, especially for the black background.
