Gain
The Gain setting is only displayed when ISO Display Mode is set to Gain (refer to Status Settings).
Use the Gain setting to adjust the image’s brightness in the monitoring path.
The Gain range is -12.0 dB to 24.0 dB. The default Gain is 0.0 dB.
Higher Gain values create brighter images in the monitor path, and lower Gain values create darker images in the monitor path.
When you record, the Gain settings are stored as metadata and you can adjust them non-destructively in post-processing with REDCINE-X PRO or other editing tools that support R3D files.
RED recommends setting the Gain to the default of 0.0 dB, then adjusting the aperture and lighting to match.
When Extended Highlights BETA are enabled, the camera displays "EH" next to the Gain value to remind you of the increased dynamic range when deciding your exposure (refer to Extended Highlights - BETA).