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Undo History - how does it work?

Mar 20, 2014, 16:29
Post: #1
Undo History - how does it work?
I've just manipulated a photo with maybe 50 operations, mostly clone. Right in the middle of the series I made a mistake, so I want to delete operation #26 (or whatever) - remove that action - without affecting the steps that came before or after. I understand that the Undo History pane is what that's for. But all I can see how to do is find the evil Operation #26 and hit the "Undo the Last Operation" button. This does exactly what I want on the image preview, but the instant I click anywhere else in the list it pops right back. Surely the whole point is that I should be able to delete just that step?
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Mar 20, 2014, 20:40 (This post was last modified: Mar 20, 2014 20:42 by ofnuts.)
Post: #2
RE: Undo History - how does it work?
No, you cannot delete a step in the middle... what if that step added a layer and the rest is acting on that layer? The undo history is a stack: to undo a specific operation you have to undo everything from where you are to that operation. See it as an assisted Ctrl-Z. Conceptually the undo stack (because this is really what it is) is just keeping copies of the layers/channels, it doesn't remember "operations" to replay them.

The next version (2.10) of Gimp will have "non-destructive" editing, which is exactly that: remember operations, so that you can change the parameters upstream to act on the final result.

Now answering your questions on
https://Gimp-Forum.net
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Mar 20, 2014, 23:21
Post: #3
RE: Undo History - how does it work?
Rats. OK - thanks anyway!
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