Understanding Log Recordings

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RedShark News' Phil Rhodes explains the concept of log or cine-style recordings.

He writes, "The human eye responds to light more or less linearly as the real light intensity doubles. This is familiar to photographers as an exposure value, where increasing an exposure value by one always looks like the same amount of additional brightness, even though every increase in visible brightness actually represents a doubling of light intensity. If we view a scene with a single 100W light aiming at it, we could call light 100. Let's assume the scene is comfortably exposed in these circumstances, so we can call it brightness 1. To double the amount of light, we might add another 100W light, so light is 200 and brightness is 2, which is fairly intuitive. But to increase the apparent brightness by the same amount again, so that brightness is 3, we need to double the amount of light again, so that light is 400. This is of course not new; when the system of f stops and exposure value was developed, we knew that linear apparent brightness increase requires successive doubling of the amount of light. Recording log is a way of using this to improve recordings."

Read the full story here.

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