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Fig. 2C. —Use of "Dust & Scratches" filter and "History Brush." "History" palette is selected by clicking "Window" menu bar (Window Show History). Click on "bent page" icon (arrow) on lower bar of "History" palette (lower left) to create snapshot of image in filtered state (lower right). Return to Photoshop (Adobe Systems, Mountain View, CA) menu bar and select "Undo" under "Edit" bar (Edit Undo Dust & Scratches Filter," [not shown]).