D1: Gain 1x
The input is always linear display. This LUT is used for normal conditions.
D2: Gain 2x
The gain is doubled and you can display the dark areas of the image emphasized.
D3: Gain 4x
The gain is quadrupled and you can display the dark areas of the image emphasized. This LUT emphasizes the
dark portions even more than D2.
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FASTCAM SA2 / SA2 RV Hardware Manual