JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
Online ISSN : 1349-838X
Print ISSN : 0019-2341
ISSN-L : 0019-2341
Papers
Comparison of Brightness Judgment of Space between Observer within and Observer Looking into Space
Tetsuya EdaMiyoshi Ayama
Author information
JOURNALS FREE ACCESS

2006 Volume 90 Issue 5 Pages 271-280

Details
Abstract

To compare brightness judgment, we conducted two experiments. In the first one, the observer evaluated the brightness of a space while within it (“observer's space”) by determining the illuminance of another room which gives an impression of equal brightness to that of the “observer's space”. In the second one, the observer evaluated the brightness of a space while looking into it through a small window (“observing space”). We also examined the influence of the lightness of the interior wall of the space and the existence of white paper upon brightness judgment in both situations. Results showed that the brightness of the “observer's space” was judged higher than that of the “observing space”. White walls were evaluated as brighter than black walls in both the “observer's space” and the “observing space” while illuminance of the space was kept constant. A space was judged brighter with a piece of white paper than without it especially in the “observing space”, which indicates the effect of white paper is eminent in the condition.

Information related to the author
© 2006 The Illuminating Engineering Institute of Japan
Next article
feedback
Top