I'm using PS a lot more these days but was wondering if there is some keystroke that allows you to toggle from a before view of the image to the image after you have made changes---side by side. In Lightroom, I make my changes and you merely hit the Y key and you get a before view on the left pane and an after view on the right pane. Is there something similar in Photoshop? If not, what do you people use to quickly check changes short of toggling the eye switch on a give level? Any ideas or suggestions? Thanks!
I usually just step back and forth in the history panel. The default has a snapshot of the document as opened at the top (additional snapshots can be added) so flicking between that and the current position shows me the impact of all the changes.