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So this video is a reminder that selections are very fragile. They're very temporary. If you accidentally click outside of your selection, you've deselected it. If you've spent 5-10 minutes working on that selection, it's kind of a bummer if you go off and do something else and you've lost your selection. So I'll undo that. Command+Z or Ctrl+Z will undo the last thing you did, which in this case was deselect. I know that I want to mask this back to a white background. So I'm going to, again, pretend that I don't notice that I've done this. I've accidentally deselected, because I clicked outside of my selection.
I'm going to convert this Background layer to a layer that can support transparencies. I'll just Option+Double -click or Alt+Double-click on that and I'm going to create a new layer below the current layer. If you create the new layer, by default, it's actually above the current layer. I'm going to undo that. If I hold down the Command key or the Ctrl key this time and click on the New Layer button at the bottom of the Layers panel, that new layer gets created below my active layer. So, I'm going to go ahead and hold down the Command key or the Ctrl key on Windows and press the Delete key to fill that layer with white. Well, I've done a bunch of things now. Where is my selection? Because I had accidentally deselected it, right? If I undo, Command+Z, well, or Ctrl+Z, that just undoes or redoes the last thing I did. So deselecting a selection was many, many steps ago.
I want to keep all the work I've done. So I don't want to go back in history just to get that selection. I want to use a Reselect command. Under the Select menu, Photoshop actually tracks and remembers the last selection you had. There is a command specifically for this, the Reselect command. The Deselect command is Command+D or Ctrl+D. The Reselect command is Command+Shift+D or Ctrl+Shift+D. So I'm just going to use the modifier and keyboard shortcut method, Command+Shift+D, Ctrl+Shift+D to bring my selection back. So no worries, if you accidentally deselect and then go on to do other things. If you need to get your last selection back, just use that keyboard shortcut, Command+Shift+D, Ctrl+Shift+D.
Let's go back to our target layer here at the top and add a layer mask to that. Now I've masked that selection, turned it into a layer mask and I'm masking that back to that white layer underneath. So the Reselect command is also your friend.
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