ON1 Photo RAW 2019 has a robust Undo capability, which is helpful when you wish to back up a few steps during the editing process. When you want to go back further, it can be tedious to keep pressing Command/Control-Z. That’s where the history pane can be extremely useful. It displays every adjustment made during an editing session. From the History pane, you can scroll through your edits, all the way back to the state of your photo when you opened it for editing.
As you work, the History pane tracks all of your edits—even when working with layered files—adding each change you make to the top of the pane. History displays not only the adjustment, but in many cases will display the settings of sliders in the various panes and filters.
You can scroll through the list, and, if you click on an item, Photo RAW will “roll back” your edits to the spot you clicked. You can click up and down in the list, and, as long as you don’t make any changes, the entire Edit history is preserved. If you roll back to an edit and make a change, the History pane “resets” from that point on, losing any of the edits you made after the point you rolled back.
The History feature is designed to help you refine and understand the edits you made during an editing session; it not saved once you finish editing a photo. If you go back to Browse, open another image for editing from the Filmstrip, or switch to Resize, the History pane resets.
TIP: If you click on an item in the History pane, and you wish to step up or down in the adjustment history from that point, you can use the Undo/Redo commands to quickly go through the list. If you are happy with your edits, click back on the top item in the History pane to preserve the state of the photo.