Graphics Programs Reference
In-Depth Information
The same holds true for dark scenes, such as the image (left) of
Dr. Robin Wallace, where the dark values would typically tend to
expose as middle gray.
In more dynamic lighting situations, where both an extreme bright
and extreme dark scene exist together (see image below), the meter
would set the exposure to achieve neutral gray, which is under-
exposed for white and overexposed for black. In order to get the
right exposure, you will need a system to evaluate highlights and
shadows in the i eld.
With the camera set in an automatic exposure mode, every scene
will record with the same average middle gray density, regardless of
subject. The results will eventually leave you with a fair number of
bad exposures, lost moments, and ensuing frustration, especially in
situations with dii cult lighting.
The Zone system uses a spot meter that can measure the light in
a small area of our photo. The photographer “pre-visualizes” the
value desired for the area measured and adjusts the exposure
appropriately. If the area measured needs to be almost black it is
made into a Zone II or III, which is two or three f-stops less light than
what the meter reads at Zone V, or a minus 3 easliy adjusted with the
exposure compensation feature of most digital cameras.
Extreme lighting situation
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