title: Effect of field view size and lighting on unique-hue selection using Natural Color System object colors.
abstract: The aim of this study was twofold, first to determine the effect of field view size and second of illumination conditions on the selection of unique hue samples (UHs: R, Y, G and B) from two rotatable trays, each containing forty highly chromatic Natural Color System (NCS) samples, on one tray corresponding to 1.4° and on the other to 5.7° field of view size. UH selections were made by 25 color-normal observers who repeated assessments three times with a gap of at least 24h between trials. Observers separately assessed UHs under four illumination conditions simulating illuminants D65, A, F2 and F11. An apparent hue shift (statistically significant for UR) was noted for UH selections at 5.7° field of view compared to those at 1.4°. Observers' overall variability was found to be higher for UH stimuli selections at the larger field of view. Intra-observer variability was found to be approximately 18.7% of inter-observer variability in selection of samples for both sample sizes. The highest intra-observer variability was under simulated illuminant D65, followed by A, F11, and F2.
authors.affiliation: Color Science and Imaging Laboratory, TECS Dept., North Carolina State University, Raleigh, NC 27695-8301, United States. Electronic address: rshamey@ncsu.edu.
authors.forename: Renzo
authors.initials: R
authors.lastname: Shamey
authors.affiliation: Color Science and Imaging Laboratory, TECS Dept., North Carolina State University, Raleigh, NC 27695-8301, United States.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Zubair
authors.affiliation: Color Science and Imaging Laboratory, TECS Dept., North Carolina State University, Raleigh, NC 27695-8301, United States.
authors.forename: Hammad
authors.initials: H
authors.lastname: Cheema
mesh_terms: D000328:Adult; D003118:Color Perception / Q000502:physiology*; D005260:Female; D006801:Humans; D008029:Lighting; D008297:Male; D015588:Observer Variation; D010775:Photic Stimulation / Q000379:methods; D014794:Visual Fields / Q000502:physiology*
keywords: Field view size; Natural Color System; Unique hues