Synfig supports animating frames without having the artist draw each frame. It uses spatial and temporal resolution independence, which means that like other vector programs the images are always sharp even when resized and the the animations remain smooth at any framerate.
Synfig is capable of importing GIMP and SVG vector images. It has an arsenal of drawing tools including color editors, Bline tools, region layers, draw tools, gradient tools, masking and outline tools that give artist the best they can ever have in computer drawing.
Animation with Synfig uses keyframes, time track Panels and Waypoints. There is also reuse of animations, Bline following among other algorithms that facilitate the animation process.
You can also perform morphing and cut outs with Synfig. Render options with Synfig include BMP, MPG, DV, JPEG, OPEN-EXR, PNG, LIBAV and ImageMagick. Shading is simulated internally on a frame by frame basis in Synfig. Most of these features would normally be highly manual but Synfig automates them.