Скачать или смотреть Perceptual Bases for Rules of Thumb in Photography, Vision Science Series, Learning in Retirement

Organized by Donald Mastronarde, Professor of the Graduate School, Emeritus Melpomene Distinguished Professor of Classical Languages and Literature

Perceptual Bases for Rules of Thumb in Photography
Martin S. Banks, Professor of Optometry and Vision Science

Pictures (photographs, computer-graphic images, PowerPoint slides) are widely used in society to convey information. Professor Banks will discuss three perceptual phenomena associated with picture viewing. 1) Why viewing pictures from the wrong place (e.g., too far to the side) has little perceptual effect, and sometimes why viewing pictures from the right place leads to perceived distortions. 2) Why depth-of-field blur affects the perceived scale of a scene. Too much blur makes scenes look small. Too little makes them look large. 3) Why different lens focal lengths affect the perceived depth in a picture. Short lenses make depth look expanded. Long lenses make it look compressed. Professor Banks will argue that the three phenomena can only be understood from an analysis of the underlying geometry in image formation, from knowledge of viewing habits, and from knowledge of perceptual mechanisms that have clear value in the natural environment. These observations lead to suggestions on how best to construct pictures to facilitate the creator’s intent.