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Dwindling Size Perspective
Photographic Lighting - 14209_135

Photography (Basic) - Introduction to photography and other graphic techniques
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Figure 5-23.–Atmospheric perspective. ground helps you to perceive the overall depth of the scene. Atmospheric   Perspective For all practical purposes, air is transparent. For most  photography,  this  is  fundamentally  true;  however, when pictures are made of subjects at great distances, the air is actually less than fully transparent. This is because air contains very fine particles of water vapor, dust, smoke, and so on. These particles scatter light and change its direction. The presence of scattering shows distant subjects in pictures as having a veil or haze. The appearance  or  effect  of  this  scattering  is  proportional  to the  distance  of  the  objects  from  the  viewpoint.  The greater the distance, the greater the amount of veiling or haze (fig. 5-23). The effects of this scattering of light are additive,  but  vary  with  atmospheric  conditions. 302.305 In atmospheric perspective several factors must be considered: Contrast–The luminance of each object in a scene is a direct result of the objects reflective quality and the amount of light falling on it. When objects are far away, light  from  highly  reflective  objects  is  scattered; therefore, when viewed from a distance (or imaged on a print), the darker portions of these distant objects do not appear as dark and the contrast is reduced. When there are objects both near and far from the camera, the difference in contrast provides a perception of distance. Brightness–The particles in air that scatter light are also illuminated by the sun. This causes an increase in the overall brightness of the objects seen. This increase in luminance, coupled with a loss of contrast, causes  objects  in  the  distance  to  be  seen  and 5-26







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