The "Undo" operation is pretty much only limited to the amount of hard drive space you have on your system. If you have plenty of hard drive room and make many changes to your images, you may wish to allot more of this space to the "Undo" operation. This way, you will be able to undo many more changes than the default.

To allow more space for the "Undo" opeartion, click the "File" menu, choosing "Preferences" then "General Program Preferences". On the multi-tabbed dialog box that follows, click the "Undo/Redo" tab. Make sure "Limit undo/redo disk usage..." is checked. Change the "100" or whatever other megabyte of space is listed in the box to the amount of megs you wish to allot for image undos. When you are done, press "OK" to close the dialog box.

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