Lightness, brightness, and brightness contrast: 2. Reflectance variation

Changes of annulus luminance in traditional disk-and-annulus patterns can be perceived to be either reflectance or illuminance changes. In the present experiments, we examined the effect of varying annulus reflectance. In Experiment 1, we placed test and standard patch-and-surround patterns in identical Mondrian patchworks. Only the luminance of the test surround changed from trial to triaL., appearing as reflectance variation under constant illumination. Lightness matches were identical to brightness matches, as expected. In Experiment 2, we used only the patch and surround (no Mondrian). Instructions said that the illumination would change from trial to trial. Lightness and brightness-contrast data were identical; illumination gradients were indistinguishable from reflectance gradients. In Experiment 3, the patterns were the same, but the instructions said that the shade of gray of the test surround would change from trial to trial. Lightness matches were identical to brightness matches, again confirming the ambiguity of disk-and-annulus patterns.

[1]  K. Koffka.  Principles Of Gestalt Psychology , 1936 .

[2]  O. Reiser,et al.  Principles Of Gestalt Psychology , 1936 .

[3]  H. Wallach.  Brightness constancy and the nature of achromatic colors. , 1948, Journal of experimental psychology.

[4]  H. Leibowitz,et al.  Simultaneous contrast as a function of separation between test and inducing fields. , 1953, Journal of experimental psychology.

[5]  H Takasaki,et al.  Lightness change of grays induced by change in reflectance of gray background. , 1966, Journal of the Optical Society of America.

[6]  P. Whittle,et al.  The effect of background luminance on the brightness of flashes. , 1969, Vision research.

[7]  I. Rock,et al.  An introduction to perception , 1975 .

[8]  S. Howard Bartley,et al.  Introduction to Perception , 1980 .

[9]  A. Gilchrist,et al.  The classification and integration of edges as critical to the perception of reflectance and illumination , 1983, Perception & psychophysics.

[10]  Julian Hochberg,et al.  Representation of motion and space in video and cinematic displays , 1986 .

[11]  L. Arend,et al.  Simultaneous constancy, lightness, and brightness. , 1987, Journal of the Optical Society of America. A, Optics and image science.

[12]  A. Gilchrist.  Lightness contrast and failures of constancy: A common explanation , 1988, Perception & psychophysics.

[13]  L E Arend,et al.  Lightness and brightness over spatial illumination gradients. , 1990, Journal of the Optical Society of America. A, Optics and image science.

[14]  P. Whittle.  Brightness, discriminability and the “Crispening Effect” , 1992, Vision Research.

[15]  L. Arend.  Mesopic lightness, brightness, and brightness contrast , 1993, Perception & psychophysics.

[16]  L. Arend,et al.  Lightness, brightness, and brightness contrast: 1. Illuminance variation , 1993, Perception & psychophysics.