Nikon A Reference Manual - Page 240

3 Compare the copy with the Options used to create original. copy The source image is displayed on the left, the retouched copy on the right, with the options used to create the copy listed at the top of the display. Press 4 or 2 to switch between the Source Retouched source image and the image copy retouched copy. To view the highlighted picture full frame, press and hold the X button. If the copy was created from two images using Image overlay, press 1 or 3 to view the other source image. If multiple copies exist for the current source image, press 1 or 3 to view the other copies. To exit to playback mode, press the K button, or press J to return to playback with the highlighted image displayed. D Side-by-Side comparison The source image will not be displayed if the copy was created from a photograph that was protected (0 146) or on a locked memory card (0 24). U 220