Image Sink 
Image Sink is used to save the image to the specified folder.
Sink configuration 
On the rule page, click Add action and set the following:
- Path: The file path where the result is saved, such as - /tmp.
- Image Format: The image format, supports jpeg, or png. 
- Max Age: Maximum file storage time (hours). The default value is 72, which means that the picture can be stored for up to 3 days 
- Max count: The maximum number of stored pictures. The default value is 1000. The earlier pictures will be deleted. The relationship with "Max Age" is OR.