ViTiny UM20-GN, User Manual

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(3-1) SELECT: Select the areas which needs to be adjusted.
4 areas are selectable.
(3-2) DISPLAY: Display the selected area.
(3-3) BLACK MASK: Shade the over exposed area into Black.
(3-4) LEVEL: Set Threshold for over exposed image.
(3-5) DEFAULT: Return to factory default setting.
(3-6) RETURN: Return to last page or Save & End Menu.
(4) WDR :Wide Dynamic Range. WDR allows an imaging
system to correct the intense back light surrounding
subject and thus enhances the ability to distinguish
features and shapes on the subject. See below for setting
WDR.