LR 2 - how to undo changes after unselecting picture?

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hi,

 

i bunch of edits on picture a.  then, go picture b , edits.  then, when go picture , decide change it, don't see option undo edits more.  thought in "history" section in develop menu.  shows every single thing did picture.  but, when try delete (by selecting , hitting delete key) part of history, nothing happens.  doing wrong?  i've been having reset whole picture because can't figure out how undo of edits (and when deselect off of picture , come later - know undo option).  thanks!

you can't delete step in history panel. if select previous state perform adjustment on image, states above in list (i.e., recent changes) discarded , replaced adjustment made.

 

there's lots more history stuff. if haven't done so, review lr pdf document, “managing image history , snapshots” on page 114.



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