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Effect of filters upon object color naming
Summary
Color constancy, how we perceive object colors despite lighting changes, generally holds well. However, filters can cause slight shifts, making colors appear differently under varied conditions.
Area of Science:
- Visual Perception
- Color Science
- Psychophysics
Background:
- Color constancy is the perceptual stability of object colors under varying illumination.
- Deviations from perfect color constancy can occur, particularly with chromatic adaptation.
- Ophthalmic tints can influence color perception and may induce such deviations.
Purpose of the Study:
- To investigate deviations from color constancy using filters similar to ophthalmic tints.
- To quantify the impact of chromaticity shifts on color perception.
- To understand how observer adaptation interacts with illuminant changes.
Main Methods:
- Munsell color chips were used for forced-choice categorization into red, yellow, green, or blue.
- Testing involved 23 adaptive conditions simulating real-world chromaticity shifts.
- The study precisely located color boundaries under experimental filter conditions.
Main Results:
- Color constancy was generally well-maintained across conditions.
- Specific filters caused noticeable shifts in color boundaries, indicating imperfect constancy.
- Red filters increased the perception of red, blue/green filters increased blue perception, and Planckian locus filters increased green perception.
Conclusions:
- Color constancy is robust but not absolute, with measurable deviations.
- Ophthalmic-like filters can alter color perception, impacting the accuracy of color constancy.
- Understanding these shifts is crucial for applications involving controlled color viewing.