Huawei P30 User Manual page 60

Capture Rivers and Waterfalls with Silky Water
The Silky water feature lets you capture silky smooth photos of waterfalls and rivers.
This feature works best with a stream or waterfall with lots of water.
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Place your device on a tripod or solid surface so that it does not move during the exposure.
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Go to Camera > More > Light painting > Silky water. Hold your device steady, then touch
to start shooting. A preview of the image will be displayed in the viewfinder. Touch
you are finished.
Camera
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