One reason for using layers is to allow you to make various changes to the image and then if you don't like them you can easily revert to the original by getting rid of the layer. Among other benefits, this is said to prevent pixels in the original image from being destroyed by the changes as presumably would be the case if layers weren't used and instead the changes were reversed manually. However, it's also possible to reverse changes in other ways, e.g. by use of the history feature or by an "edit - undo" command. My question is whether either of these two methods destroys pixels? For example, using the dodge tool to lighten an area destroys pixels (at least I think it does, which is why I seldom actually use it). If I then decide not to keep the dodge and so get rid of that step either through the history feature or by an "edit-undo dodge" command (as opposed to doing the dodge on a duplicate layer) are the pixels destroyed by the dodge restored just as they would be if they had been made on a duplicate layer?
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