QUANTIFYING PERCEIVED CHROMA CHANGES BY HUNT EFFECT IN LIGHTING

摘要

Our previous experiment showed that the Hunt Effect was effective at normal indoor lighting levels. The purpose of this study is to quantify the level of perceived chroma increase by the Hunt Effect. Two identical colour patches were placed on the left and the right side of the booth. The left side of the booth was illuminated at 1000 lx with a broadband spectrum and the right side was illuminated at 100 lx or 300 lx with chroma-increasing lights with different chroma increase levels. Subjects viewed each side of the booth with each eye (haploscopic viewing condition) and were asked to select a light of the right side that matched the colour of the right-side target closest to the left one. Results showed that increased chroma by 15 to 18 in ΔC_(ab)~* were needed for the right side to match perceived chroma. The chroma increase was smaller at 300 lx.