Click the image layer name in the Canvas Layer Editor window.

You can only sketch on one image layer at a time. This image layer is referred to as the active image layer. In order to sketch on an image layer you must select it (making it the active image layer).

You may also need to select an image layer in order to:

• duplicate it

  See Duplicate an image layer.

• associate or dis-associate a mask layer with it.

  See Dis-associate or associate a mask with an image layer.

• merge it with another image layer, or

  See Merge image layers.

• delete it.

  See Delete an image layer.

The active image layer is indicated by the button in the active view window title bar, and is highlighted in purple in the Canvas Layer Editor window.