Duplicate image

The Duplicate command in the Image menu copies the open image to another window. The duplicate is given the title Copy of (name of open image) but can be renamed when you save it.

The duplicate is in every way the same as the original and can be edited in all the usual ways, including the addition of layers. To switch between the duplicate and the original click on the Window menu and select the relevant name at the bottom of the menu.

See:

Image menu