refers to the technique of adjusting the colours of the rendered image in a camera in order to bring them within a value range that looks better on a computer screen
This is usually used when using techniques such as IBL or physical sun. It is also used when using the mia materials. these are physically accurate and menat to simulate the materials in the real world.
1: render
2: go to cam under mental ray, click on the checker box of lens shader and select mia_exposure_simple
3: set pedestel to a negative level. It decreases the level, this adds black
gain increases the over all brightness, so devrease gain. Knee is used for fine tuning.
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