Colour contrast influences perceived shape in combined shading and texture patterns.

Full Abstract

The 'colour-shading effect' describes the phenomenon whereby a chromatic pattern influences perceived shape-from-shading in a luminance pattern. Specifically, the depth corrugations perceived in sinusoidal luminance gratings can be enhanced by spatially non-aligned, and suppressed by spatially aligned sinusoidal chromatic gratings. Here we examine whether colour contrast can influence perceived shape in patterns that combine shape-from-shading with shape-from-texture. Stimuli consisted of sinusoidal modulations of texture (defined by orientation), luminance and colour. When the texture and luminance modulations were suitably combined, one obtained a vivid impression of a corrugated depth surface. The addition of a colour grating to the texture-luminance combination was found to enhance the impression of depth when out-of-phase with the luminance modulation, and suppress the impression of depth when in-phase with the luminance modulation. The degree of depth enhancement and depth suppression was approximately constant across texture amplitude when measured linearly. In the absence of the luminance grating however, the colour grating had no phase-dependent affect on perceived depth. These results show that colour contrast modulates the contribution of shading to perceived shape in combined shading and texture patterns.

Learn Faster Today Improve your study skills

Author information

Author/s: Kingdom, Frederick A A (FA); Wong, Karen (K); Yoonessi, Ali (A); Malkoc, Gokhan (G);

Affiliation: McGill Vision Research Unit, 687 Pine Av. W., Room. H4-14, Montreal, PQ, H3A 1A1, Canada. fred.kingdom(-atsign-)mcgill.ca

Journal and publication information

Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't

Journal: Spatial vision (Spat Vis), published in Netherlands. (Language: eng)

Reference: 2006-; vol 19 (issue 2-4) : pp 147-59

Dates: Created 2006/07/25; Completed 2006/08/10; Revised 2006/11/15;

PMID: 16862837, status: MEDLINE (last retrieval date: 12/26/2008)

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

External Links for this article (including full text providers, if available):

Click Electronic Full-text Provider Links to see options for finding the electronic full text links to this article. Note there may be a subscription or fee required for access to the full text. See our FAQ for information on finding FREE full text articles.

This article may also be located in paper journal collections available in many libraries. Use the Journal and Publication Information above to find the full article.

MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Color Perception - physiology
Contrast Sensitivity - physiology
Depth Perception - physiology

Humans
Pattern Recognition, Visual - physiology
Photic Stimulation

These are the highest related articles currently in the database:

See 100+ related articles.