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Basic Photographic Materials and Processes, 3rd Edition by Nanette L. Salvaggio

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Chapter 12

Visual Reproduction

image

Photograph by Sarah Priestap, Photojournalism student, Rochester Institute of Technology.

 

Post-Stimulus Perception

Some of the light now reaching the earth from distant stars and galaxies originated millions and even billions of years ago. Events being observed through powerful telescopes are not happening now but actually occurred long ago. Our visual system does not operate on real time even for events viewed at small distances. The delay between when light falls on the retina in the eye and the perception, although measurable, is extremely short and is of little importance. Perceptions that occur after light ...

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