Canon PIXMA MG2440 - Manual (Page 286)

Merge Frames View
You can merge still images captured from a video in the order of the time code to create an
image depicting the flow of a moving subject.
Select the images you want to merge in the Video Frame Capture view, then click Merge
Frames to switch to the Merge Frames view.
Important
You can merge between 5 and 30 still images.
Still images corrected in the Correct view cannot be used. The original uncorrected still
images will be used.
Note
It is recommended that you use still images captured from a video recorded with a
steady camera (fixed to a tripod, etc.) without zooming or adjusting focus while
recording.
Some portions of subjects may appear transparent if frames in which moving subjects
overlap are selected.
Frames may not merge properly in the following cases.
When using a video recorded in a place where the background is moving
When frames in which moving subjects/shadows overlap are selected
When using a video recorded in a place where moving subjects and the background
have similar colors and shapes
When using a video in which the brightness or lighting changed while recording
When using a video recorded using special functions such as miniature effect
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