Quantitative Study of Illuminant Mode and Surface Mode on a CRT

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  • CRT画像の表面色モードと光源色モードの見えの特性とその定式化の試み
  • CRT ガゾウ ノ ヒョウメンショク モード ト コウゲンショク モード ノ

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On a CRT, we can see two modes of color appearance: illuminant mode and surface mode. These interchange as the luminance of the stimulus itself and its background changes. We investigated the relationship between the mode appearance and the luminance, and presented an equation expressing the illuminant mode appearance function of stimulus luminance and background luminance. The appearances of these modes are rated using the rating scale method.<BR>For constant background luminance, the appearance of illuminant mode increases linearly with increasing logarithmic stimulus luminance. The higher the background luminance is, the lower the luminance ratio needed to perceive the same degree of illuminant mode. For constant stimulus luminance, the appearance of illuminant mode decreases slowly when the background luminance is sufficiently low. But after the luminance ratio has dropped to a certain level with the background luminance increasing, the illuminant mode disappears rapidly.<BR>According to the obtained equation, the scores of illuminant mode appearance are directly proportional to the logarithmic luminance ratio, and its coefficient is linear with respect to the background luminance.

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