Chapter 23. Depth of Field: A Survey of Techniques
Joe Demers NVIDIA
What Is Depth of Field?
Depth of field is the effect in which objects within some range of distances in a scene appear in focus, and objects nearer or farther than this range appear out of focus. Depth of field is frequently used in photography and cinematography to direct the viewer’s attention within the scene, and to give a better sense of depth within a scene. In this chapter, I refer to the area beyond this focal range as the background, the area in front of this range as the foreground, and the area in focus as the midground.
The depth-of-field effect arises from the physical nature of lenses. A camera lens (or the lens in your eye) allows light to pass through to the film ...
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