The Collaborative International Dictionary of English v.0.48:

morphing \morph"ing\ (m[^o]rf"[i^]ng), n. (Computers)
   The smooth transformation of one shape or image into another,
   displayed on the computer screen as a series of images that
   appear to be continuous, as if in a movie.
   [PJC]

The Free On-line Dictionary of Computing (30 December 2018):

morphing

    The animated transformation of one image into
   another by gradually distorting the first image so as to move
   certain chosen points to the position of corresponding points
   in the second image.

   Compare tweening.

   (1995-04-03)