RED EPIC OPERATION GUIDE
COPYRIGHT © 2013 RED.COM, INC
955-0002_v4.0, REV-C
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ISO 100
No Exposure
Adjustment
In these extreme examples, it is clear that the RGB domain images are respectively very bright and very
dark. The histogram data reflects that, however you can also see that the sensor RAW meters are
unchanged. The exposure at the sensor at this point in time is the same. If you choose to close the iris to
reduce the brightness of the first image you will be reducing exposure at the sensor – this biases exposure
in favor of protecting the scene highlight. Alternatively, if you choose to open the iris to increase the
brightness of the image of the second image you will be increasing exposure at the sensor – this biases
exposure in favor of minimizing noise in the scene shadows.
The technique is similar in principle to re-rating a film stock. With practice, the ISO rating can be used as a
tool to assist ideal exposure based on the dynamic range identified within the scene.
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