Simultaneous and Successive Comparison for Brightness of Colored Lights

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  • Uchikawa Keiji
    Department of Information Processing, Tokyo Institute of Technology Graduate School
  • Ikeda Mitsuo
    Department of Information Processing, Tokyo Institute of Technology Graduate School

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  • 色光の明るさの同時比較と継時比較
  • ショッコウ ノ アカルサ ノ ドウジ ヒカク ト ケイジ ヒカク

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Abstract

Simultaneous juxtaposed brightness comparison has been used as a standard method for measuring brightness of colored lights. However, it is a more common task in our everyday lives to successively compare brightness of colored lights. In this report, we performed simultaneous and successive brightness matching between test lights and the: comparison white light to study differences yielded by these two comparison methods. In the simultaneous comparison condition, a test stimulus andt he comparison stimulus were presented at a same time for 1 sec, whereas in the successive comparison condition, a test stimulus was presented first, then the comparison stimulus appeared being preceded by 10 sec blank. The observer adjusted intensity of the comparison to make brightness match between the test and the comparison stimuli. White and 450, 490, 530, 570, 610, and 650 nm monochromatic lights were used-as test lights. The results show that test stimuli of longer wavelengths were estimated darker than other test stimuli, and that the standard deviation of brightness matching for successive comparison was greater than for simultaneous comparison. Some important implications about these results are discussed.

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