You can undo most actions as you edit an image. Use the Undo command to remove brush strokes, color adjustments, effects, etc. Use the Redo command to reapply a command that you have undone.
What you can’t undo: In Paint Shop Pro you can undo most actions—with these exceptions: renaming files, saving files, opening and closing files, emptying the clipboard, changes that are program-wide and not specific to the current image (such as changes to color settings and preferences), and actions that do not change image pixels (such as zooming and scrolling).
To undo the last action:
Click the Standard toolbar's Undo button , or choose Edit > Undo, or press Ctrl + Z.
If the action can’t be undone, the Undo button and menu command are inactive.
Note that you can also undo actions via the History palette.
To redo the last action:
Click the Standard toolbar's Redo button , or choose Edit > Redo, or press Ctrl + Alt + Z.
Note that you can also redo actions via the History palette.
To revert to the last saved version of an image:
Choose File > Revert.
Undoing and Redoing History Palette Actions