Introducing adjustment layers

Adjustment layers are a nondestructive way to make adjustments in Photoshop.…You can see that we have an Adjustments panel dedicated to them, and each one of…these little icons is a different Adjustment layer.…As we roll over the icon, we can either see a tool tip if we hover, or you'll…notice that the name changes right up here.…So I don't want you to be confused with the adjustments that are found under the Image menu.…When you select Image>Adjustments, although a lot of the same names and the…same adjustments are listed here, these are going to be permanent changes.…

So, for example, if I decide to do something like change the levels in my image,…and I'll explain what this dialog box does in a minute, but any change that I…make here, when I click OK, the pixels in my image have been changed.…The only way to get back to where they were before is either to select Undo…right now, Cmd+ or Ctrl+Z or revert the file.…So it's a very destructive way of editing, and I prefer to use the Adjustment…