Open the Google Slides presentation
Go to the slide containing the image
Right-click the image
Select Save to Keep
In the Keep sidebar, right-click the image
Select Save image as
Choose a location on your device
Click Save
Open the Google Slides presentation
Go to the slide containing the image
Right-click the image
Select Save to Keep
In the Keep sidebar, right-click the image
Select Save image as
Choose a location on your device
Click Save