Clear an image layer

Sketching > How do I? > Organize a sketch using image layers >

Select the image layer and click the button.

When you clear an image layer, all paint is removed from the unmasked regions of the image layer, but the image layer is not deleted. No paint is removed from pixels protected by either layer masks or marquee selections.

You can then continue sketching on the image layer.

To clear an image layer

Select the image layer you want to clear.
See Select an image layer.
In the Canvas Layer Editor, do one of the following:
Click the button.
Choose Edit > Clear Layer from the menus.
All paint is cleared from the image layer.