Separate effects of background and illumination on lightness Cover Image

Efekat boje pozadine i osvetljenja na opaženu svetlinu
Separate effects of background and illumination on lightness

Author(s): Sunčica Zdravković
Subject(s): Cognitive Psychology, Comparative Psychology, Experimental Pschology
Published by: Društvo psihologa Srbije
Keywords: lightness; illumination; simultaneous lightness contrast; increments -decrements; ratio principle (illusions; color; brightness);

Summary/Abstract: Four experiments attempted to establish an effect of context on lightness. Lightness is one of the dimensions of color and it varies from black to white. Most of our stimuli were inspired by simultaneous lightness contrast illusion. First two experiments contrast the size of an effect produced by the change of background color vs. the change in illumination. The third experiment deals with different type of illusions, where the effect is obtained through the appearance of multiple illumination levels. The last experiment takes into account the ratio of the target and the background. The results reveal the size of effects produced separately by the background color and illumination level and suggest the prime importance of background. Also there are other factors such as reflectance range in the scene, incremental and decremental targets, and 2D vs. 3D representation.

  • Issue Year: 40/2007
  • Issue No: 4
  • Page Range: 543-565
  • Page Count: 23
  • Language: Serbian