logging in or signing up Is colour an illusion Venere Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 360 Category: Entertainment License: All Rights Reserved Like it (1) Dislike it (0) Added: January 14, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Is Colour an Illusion? Some contrast effects and the problem of constancy: Is Colour an Illusion? Some contrast effects and the problem of constancy Harald Arnkil Lecturer, Colour Studies, School of Visual Culture MediaLab, 25.10.2006 harald.arnkil@uiah.fi Slide2: ”…the brain has to extract information about the essential, non-changing, apects of the visual world from the ever-changing information that is reachig it.” Semir Zeki, Inner Vision - An Exploration of Art and the Brain, 2003Slide14: Is colour constancy a higher cognitive processes? But …even goldfish are found to have it!Slide16: B) Reflectance image A) Illuminance image C) Luminance image The problem: How does the brain determine B from C? Slide25: The Benary effect White’s illusion De Valois & De ValoisSlide30: Cornsweet – Craik – O’Brien effectSlide31: From Edward H. Adelson: (a) The local ambiguity of edges. (b) A variety of junctions. Variations of the Craick – Cornsweet – O’Brien illusionSlide36: Is the small chequer-board in shadow or are its lightest squares of medium grey reflectance?Slide37: The significance of edges: shadow and penumbraSlide38: How to separate brightness and lightness? The brain uses subtle visual clues to determine real surface lightness = reflectance of surface that is independent of illumination changesSlide49: Barton L. Anderson & Jonathan Winawer You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Is colour an illusion Venere Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 360 Category: Entertainment License: All Rights Reserved Like it (1) Dislike it (0) Added: January 14, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Is Colour an Illusion? Some contrast effects and the problem of constancy: Is Colour an Illusion? Some contrast effects and the problem of constancy Harald Arnkil Lecturer, Colour Studies, School of Visual Culture MediaLab, 25.10.2006 harald.arnkil@uiah.fi Slide2: ”…the brain has to extract information about the essential, non-changing, apects of the visual world from the ever-changing information that is reachig it.” Semir Zeki, Inner Vision - An Exploration of Art and the Brain, 2003Slide14: Is colour constancy a higher cognitive processes? But …even goldfish are found to have it!Slide16: B) Reflectance image A) Illuminance image C) Luminance image The problem: How does the brain determine B from C? Slide25: The Benary effect White’s illusion De Valois & De ValoisSlide30: Cornsweet – Craik – O’Brien effectSlide31: From Edward H. Adelson: (a) The local ambiguity of edges. (b) A variety of junctions. Variations of the Craick – Cornsweet – O’Brien illusionSlide36: Is the small chequer-board in shadow or are its lightest squares of medium grey reflectance?Slide37: The significance of edges: shadow and penumbraSlide38: How to separate brightness and lightness? The brain uses subtle visual clues to determine real surface lightness = reflectance of surface that is independent of illumination changesSlide49: Barton L. Anderson & Jonathan Winawer