Colour afterimages: computing and measuring virtual colour perception provided by two display types

Abstract

Afterimages are common and frequent perceptual phenomena of everyday life. When looking into a bright light source compared to environment and suddenly turning the eyes away from it, the illusionary image of the light source remains in perception, for a while. A subordinate to afterimages defined in our research is virtual colour perception that, according to our interpretation is an unusual and intense temporary colour perception provoked by quick colour change in the incident light. Modelling virtual colour perception can be useful in the field of visual design, for example in dynamic advertising. A computational kinetic model established for simulating and quantifying virtual colour perception was developed in our previous work and was validated with preliminary tests involving 20 observers. Validation test results were contestable due to the high variance (about 50 RSD%) of duration and intensity of afterimage results at each incident light colour change. Thus, in our current work, validation on one-observer tests was performed to minimize the variance of results. Further, these validation tests were run on two liquid crystal display (LCD) types: a nowadays frequently present In-Plane Switching (IPS) display providing vivid colours, and an older LCD-TN (twisted nematic) display.