SIGMA DP3 Quattro - Manual (Page 108)

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4
A confirmation dialog will be displayed by pressing the or button.
5
Select [ Yes] by using the buttons and press the button to apply the
setting. If you want to cancel to apply the setting, select [ No] by using the
buttons and press the button.
EXPOSURE WARNING
It is possible to indicate the over-exposed areas by highlighting them in red.
Set to [ On] from [ Playback Menu] (P.27) → [Exposure Warning].

The Exposure Warning is not indicated in the Quick Preview.
To dismiss the Exposure Warning, set to [ Off] from [ Playback Menu]
(P.27) → [ Exposure Warning].
TIP

The button can be set as a shortcut button for Exposure Warning
[ On/Off] (Refer P.109).