

There are two techniques for that: Morphing animation Cutout animation Morphing is a technique that takes two images and creates a smooth transition between them.

Syng Studio is built to eliminate the need to draw each frame individually. To create good illusion of movement you need to draw many frames, thats why his method requires a lot of time and resources. Those images are called "frames" and thus such method called "frame-by-frame animation". Traditionally 2D animation is created by drawing each displayed image individually. According to Wikipedia, animation is the rapid display of a sequence of images in order to create an illusion of movement. It is designed to produce lm-quality animation with fewer people and resources. Syng Studio is open-source 2D vector animation software.
