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Effect of field view size and lighting on unique-hue selection using Natural Color System object colors.pdf
Vision Research 113 (2015) 22–32
Contents lists available at ScienceDirect
Vision Research
journal homepage: /locate/visres
Effect of ?eld view size and lighting on unique-hue selection using Natural Color System object colors
Renzo Shamey ?, Muhammad Zubair, Hammad Cheema
Color Science and Imaging Laboratory, TECS Dept., North Carolina State University, Raleigh, NC 27695-8301, United States
article info
Article history: Received 23 October 2013 Received in revised form 19 March 2015 Available online 19 May 2015
Keywords: Unique hues Field view size Natural Color System
abstract
The aim of this study was twofold, ?rst to determine the effect of ?eld 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° ?eld of view size. UH selections were made by 25 color-normal observers who repeated assessments three times with a gap of at least 24 h between trials. Observers separately assessed UHs under four illumination conditions simulating illuminants D65, A, F2 and F11. An apparent hue shift (statistically signi?cant for UR) was noted for UH selections at 5.7° ?eld of view compared to those at 1.4°. Observers’ overall variability was found to be higher for UH stimuli selections at the larger ?eld 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.
ó 2015 Elsevier Ltd. All rights reserved.
1. Introduction
Color perception is a subjective sensory experience. The underlying reasons for our individual experiences are not fully known. We can only describe these experiences in simple metaphorical terms. Of fundamental interest in visual perception is that of color. Of all s
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