Nikon D4 User Manual page 266

Highlights
RGB
Highlights
4 3
1 Flashing areas indicate highlights (areas that may be
overexposed) for current channel. Hold W button
and press 4 or 2 to cycle through channels as
follows:
RGB
(all channels)
2 Displayed in yellow if picture is in non-FX format (including DX-based movie format;
0 71, 85).
I
240
1 2
100 - 1
Select R, G, B
R
(red)
1
1 Image highlights
2 Folder number–frame number
3 Highlight display indicator
1
4 Current channel
W button
G
(green)
2
....... 296
B
(blue)