When you first enter an extremely bright environment, for example, when emerging from a dark movies house into a very bright sunlit area the man carving the duck would appear like this.   But in less than a minute he will appear as seen below.  In the left photo the contrast is very low.  Below the contrast is normal.

     
When light adapted a scene might look like this.

Table of Contents
Subject Index
Table of Contents [When not using frames]