Photoshop provides keyboard shortcuts for reapplying the last filter, displaying the Extract dialog box, and displaying the Pattern Maker dialog box. (You can create custom shortcuts for further filter operations if you need to perform them often.)
Windows [Ctrl]-[F], Mac [ z ]-[F]
Apply the last filter
Use this shortcut to quickly apply the last filter you used again ”for example, to the next image that you need to work with.
Windows [Ctrl]-[Alt]-[X], Mac [ z ]-[Option]-[X]
Display the Extract dialog box
Use the Extract dialog box to create a filter to isolate an object in the foreground of an image.
Windows [Ctrl]-[Alt]-[Shift]-[X], Mac [ z ]-[Option]-[Shift]-[X]
Display the Pattern Maker dialog box
Use the Pattern Maker dialog box to create patterns based on the current selection or on an item copied or cut to the Clipboard.