Lightness of surface colors at various illuminance levels
نویسندگان
چکیده
منابع مشابه
Lightness, brightness, and brightness contrast: 1. Illuminance variation.
Changes of annulus luminance in traditional disk-and-annulus patterns are perceptually ambiguous; they could be either reflectance or illuminance changes. In more complicated patterns, apparent reflectances are less ambiguous, letting us place test and standard patches on surrounds perceived to be different grays. Our subjects matched the apparent amounts of light coming from the patches (brigh...
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In asymmetric lightness matching tasks, observers sometimes report that they cannot achieve satisfactory matches between achromatic surfaces under different neutral illuminants. The surfaces appear different, yet no further adjustment of either surface improves the match. There are evident difficulties in interpreting data from a task that the observer cannot always do, and these difficulties l...
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BACKGROUND Adequate light is essential for vision during direct laryngoscopy. The ISO 7376:2009 standard specifies the minimal illuminance for laryngoscopes. No studies have objectively examined the relationship between laryngoscope illumination and visual acuity during laryngoscopy. METHODS We measured the near visual performance of 50 anesthesiologists during direct laryngoscopy using near ...
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This study aims to examine the search efficiency under low illuminance conditions for three safety colors; red, orange and yellow, which are used for danger and caution signs. They are subjected to a visual search task. Images of visual stimuli consisting of an array of colored circles placed on a large visual field (a visual angle of 40 deg.) were displayed on an 80-inch screen through a proje...
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ژورنال
عنوان ژورنال: Journal of the Illuminating Engineering Institute of Japan
سال: 1990
ISSN: 0019-2341,1349-838X,2185-1506
DOI: 10.2150/jieij1980.74.appendix_85