1. This paper presents a method for the metamorphosis of one image into another. 2. This method gives the animator high-level control of the visual effect by providing natural feature-based specification and interaction. 3. Key ideas: Morph based on fields of influence surrounding two-dimensional control primitives, line segments. 4. Advantages and disadvantages 4.1 Advantages: more expressive than other methods; easy to use, quick to get initial good results. 4.2 Disadvantages: such a global method is slow;sometimes unexpected interpolation between lines will happen; still require a lot of time from the animator to tweak the control primitives to get good final results.