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# 1.6 Recalling the Last Filter Dialog

Most GIMP filters are doted with a variety of parameters which control the filter effect. Because it is often difficult to know in advance how much of a certain filter parameter you want to apply to an image, a little experimentation is usually necessary. Unfortunately, the GIMP filters are three menus deep in the Image menu. Thus, experimenting with a filter means finding it in the appropriate submenu, evaluating its effect on the image, undoing the effect if it is unsatisfactory, and reapplying the filter with new settings. Repeatedly searching for the same filter in the system of image submenus can become annoying. One way to limit the annoyance is by tearing off the filter submenu, making access to it more rapid (see Section 1.1.2 for more on tear-off menus). A more direct method, however, is by using the keyboard shortcut for the `Re-show Last` function. The shortcut is `A-S-f`. This function recalls the dialog of the last filter applied to the image, along with the previously used dialog values. Thus, with two keystrokes, `C-z` followed by `A-S-f`, a filter effect can be undone and redone with new parameter values.

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