CHAPTER 14 The Limits of Human Vision

(How Good Does a Photographic Image Need to Be?)

 

 

 

The eye is the jewel of the body.

—HENRY DAVID THOREAU

You can observe a lot just by watching.

—YOGI BERRA

14.1 Introduction

Photography is a human activity that depends entirely on the capabilities and limitations of the human visual system. We judge the apparent resolution, brightness, contrast, and the quality of color in photographs; but these attributes are subjective since everything depends on perception. Our vision results from a combination of physiology and psychology which correspond roughly to the eye and the brain. Of course, all eyes are not the same, but a typical or standard observer must be assumed to exist by those designing photographic ...

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