D90-What is "high gain up"?

Started Nov 20, 2009 | Discussions thread
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Bullwhip
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D90-What is "high gain up"?
Nov 20, 2009

I was reviewing a 1600 iso D90 test photo exif with iexif and noticed an entry for gain as such:
Scene Capture Type = Normal
Gain Control = High gain up
Contrast = Normal
Saturation = Normal
Sharpness = Normal

Checking the manual, I found limited info about gain, other than with multiple exposures.
So where / how is this used and set for single exposures on the D90 ?

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