How do I fix unwanted lines appearing in the webcam image?
Adjust the line frequency (anti-flicker) setting to match your country's power supply frequency. In HP Webcam Control Center, select 'Record Videos or Photos,' go to Settings, then Advanced Settings, and select either 50 Hz or 60 Hz depending on your location. An incorrect setting can cause unwanted lines to appear in the image. (Page 11)
From the official HP Elite Slice manual, page 11
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