I'm using a Nikon D5000 and I think I get more noise using Active D-Lighting on Auto. If I turn it off, how can I simulate A D-Lighting in post processing? I shoot RAW.
Answer
Active D-Lighting intentionally underexposes the image and then boosts the shadows (and applies other adjustments) hence the additional noise you're noticing. This is done to increase the highlight headroom and prevent losing information by blowing the highlights.
You can get a similar effect in most raw processing software by using custom tonecurves, or more advanced features such as fill light in Adobe Camera Raw, but if you turn D-Lighting off you must remember to underexpose as lost highlight information cannot be recovered in post!
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