A method capable of converting motion image data, which is captured in an
ordinary way without intending to produce parallax image printed matter,
to data that can be printed as parallax image printed matter is provided.
The method includes the steps of specifying at least one frame as a
reference frame from a plurality of frames constituting the motion image
data, and setting a point-of-regard on an object in the reference frame,
calculating an amount of movement of the point-of-regard using a relation
between the point-of-regard in the reference frame and a point
corresponding thereto in another frame, obtaining a motion compensation
amount for each frame based on this amount of movement thereof, and
executing a motion compensation processing for the motion image data
based on the motion compensation amount, thereby converting the motion
image data to parallax image data.