By default, a ghost of each Grease Pencil sketch displays before and after the actual frame. When working with a sequence of Grease Pencil frames, you can adjust how the ghost images display to change how the images blend together during playback.

To toggle ghost frames on and off
 and 
		  Show Post-Frame Ghost
 and 
		  Show Post-Frame Ghost 
		   buttons in the 
		  Grease Pencil tool to turn ghosting on and off for all images.
 buttons in the 
		  Grease Pencil tool to turn ghosting on and off for all images. 
		To change how long ghost frames display
(Select 1, 2, 3, 4 frames, or Other to enter a custom value, up to a maximum of 10.)