Undo Reverses the effect of the most recent editing or filtering operation. Note that operations on entire stacks cannot be reversed using Undo . Cut Copies the contents of the selected rectangular area to the internal clipboard and fills it with the current background color. Note that Cut , Copy and Paste of images only works with rectangular selections.
Copy Copies the current rectangular selection to the internal clipboard.
If there is no selection, copies the entire active image. The amount of image data copied is shown in the status bar. Cut , Copy and Paste of images to other applications is currently not supported. The number of characters copied is shown in the status bar. Paste Inserts the contents of the internal clipboard into the active image.