Perceived speed of changing color in chroma and hue directions in CIELAB

Abstract

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Temporal dynamics of daylight perception: Detection thresholds

“…At the very least, the temporal properties of low-level mechanisms of chromatic adaptation must constrain the perceptibility of global changes in illumination chromaticity. Yet the slowest detectable temporal changes in illumination chromaticity that we find here are not only much lower than the rates of illumination change previously simulated (no less than 2 ∆E/s - according to calculations from the available data on the previous temporal illumination studies; Kong et al, 2019 ; Linnell & Foster, 1996 ; Nascimento et al, 1996 ; Walmsley et al, 2015 ), but also lower than the lower limits of temporal frequency typically explored in fundamental temporal contrast sensitivity measurements ( Huchzermeyer et al, 2018 ). It is therefore difficult to relate the results directly to measurements of low-level chromatic mechanisms.…”

“…If a sinusoidal stimulus had been used instead, illumination discrimination sensitivity would have been deemed the same at these two base lights. Thus, previous data on the perception of smooth illumination changes collected with periodic stimuli ( Kong et al, 2019 ) might have overlooked relevant effects of chromatic direction.…”

“…To assess sensitivity to natural illumination changes, more naturalistic stimuli are required, but the few studies ( Kong et al, 2019 ; Linnell & Foster, 1996 ; Nascimento et al, 1996 ; Walmsley et al, 2015 ) that use continuous changes are not specifically concerned with measuring detection thresholds.…”

“…More recently, Kong et al (2019) directly assessed speed perception of continuous changes in immersive illumination, generated by a five-primary LED lighting system. The individual change stimuli had a periodic temporal profile of semi-linear changes with five full periods per trial.…”

Post-Harvest Conservation of Green Maize in Different Packages

“…The instrumental coloring of the cobs is given by the coordinates L*, b*, C* and h°, determined with the aid of a digital colorimeter, which measures the reflected light, using a system of cartesian coordinates L*, a* and b*. The coordinate L* refers to the luminosity varying from black to white; the b* coordinate indicates the color variation from blue to yellow, C (chroma) which measures saturation where the value highlights the distance from the luminosity axis and starts at zero in the center and Angle hue (h°) measures the predominance of intensity of the predominant color in the cobs (Kong, Murdoch, Vogels, Sekulovski, & Heynderickx, 2019).…”