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Related Experiment Videos

"Glowing Gray" Does Exist: Luminance Gradients' Influence on Whiteness Perception.

Yuki Kobayashi1, Soyogu Matsushita2, Kazunori Morikawa1

  • 1School of Human Sciences, Osaka University, Japan.

Perception
|May 12, 2018
PubMed
Summary

This study reveals that the whiteness threshold is higher than the luminosity threshold, confirming "glowing gray." Luminance gradients significantly impact luminosity but not whiteness perception, suggesting distinct underlying mechanisms.

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Area of Science:

  • Visual Perception
  • Color Science
  • Psychophysics

Background:

  • Previous studies using luminance gradients (glare stimuli) suggested luminosity perception of targets darker than white.
  • The relationship between whiteness and luminosity thresholds in glare stimuli remained unclear.

Purpose of the Study:

  • To clarify whether the whiteness threshold in glare stimuli is higher or lower than the luminosity threshold.
  • To investigate the effect of luminance gradients on whiteness perception.
  • To explore the distinct mechanisms underlying luminosity and whiteness perception.

Main Methods:

  • Utilized luminance gradients (glare stimuli) to present brightness and lightness targets.
  • Measured perception thresholds for luminosity and whiteness.
Keywords:
glare effectlightness/brightnessluminance gradientsluminositypsychophysics

Related Experiment Videos

  • Assessed the influence of luminance gradient degree on whiteness perception.

    • Main Results:

    • The whiteness threshold was found to be higher than the luminosity threshold, supporting the existence of 'glowing gray'.
    • Luminance gradients significantly affected luminosity perception.
    • No significant effect of luminance gradients was observed on whiteness perception.

    Conclusions:

    • Confirms the existence of 'glowing gray' by demonstrating a higher whiteness threshold than luminosity threshold.
    • Highlights a discrepancy in the effect of luminance gradients on luminosity versus whiteness perception.
    • Suggests that distinct neural or cognitive mechanisms underlie luminosity (brightness) and whiteness (lightness) perception.