Nikon Z 8 Reference Manual page 262

Tip: Creating JPEG Copies from RAW Photos Shot Using the HLG Tone Mode
Selecting [To RAW processing (JPEG)] in Step 6 displays the [RAW processing (JPEG)] dialog, where
you can adjust settings for saving the copies in JPEG format. To save the JPEG copies, highlight [EXE
(save in JPEG format)] and press J.
Exposure for JPEG copies created by applying [RAW processing (JPEG)] to RAW photos shot in
HLG will be around 2 EV lower than that of JPEG copies created from RAW photos shot with [SDR]
selected for tone mode. Exposure can be corrected as desired using the [Exposure compensation]
option in the [RAW processing (JPEG)] dialog.
[Set Picture Control] appears in the [RAW processing (JPEG)] display in place of [Set Picture
Control (HLG)]. [Original] cannot be selected.
You will be able to choose options for [Color space] and [Active D-Lighting]. Note, however, that
choosing an option for [Active D-Lighting] may result in "noise" in the form of randomly-spaced
bright pixels, fog, or lines.
To return to the [RAW processing (HEIF)] display, select [To RAW processing (HEIF)] in the [RAW
processing (JPEG)] dialog.
The values selected in the [RAW processing (HEIF)] and [RAW processing (JPEG)] displays are
stored separately and are not reset after processing or when you switch from one display to another
using [To RAW processing (JPEG)] or [To RAW processing (HEIF)].
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RAW Processing