HIKVISION DS-7700NXI-I/S Series User Manual page 45

 Exposure: Set the exposure time (1/10000 to 1 sec) of camera. The larger exposure value
results in the brighter image.
 Backlight: Set the wide dynamic range (0 to 100) of the camera. When the surrounding
illumination and the object have larger difference in brightness, you should set the WDR
value.
 Image Enhancement: For optimized image contrast enhancement.
Step 4 Click the Apply to save the settings.
Network Video Recorder User Manual
44