Apple MA434Z/A User Manual - Page 827

Connection lines can be moved, and even animated, to control the speed and direction of deformation. Additional connection lines may also be created to give you more precise control over the deformation itself. Using Boundary Shapes to Limit Deformation in an Image The Warper and Morpher nodes both work by pushing and pulling pixels from the region of an image defined by the source shapes to the region defined by the target shapes. When part of an image is warped, the surrounding area stretches to accommodate the change, as if the image is on a sheet of rubber being pushed and pulled to distort it. Warp without boundary shape The region affected by the resulting deformation is not limited to the area defined by the source/target shape pairs. In fact, you'll notice that a significant area of the image surrounding each source/target shape pair is also deformed. While there is a 100 percent displacement at the actual position of the source and target shapes, the total area of deformation lessens gradually with the distance from the shape pair. This may result in a warp or morph not only affecting the intended subject, but also the surrounding background. This aspect of the Shake warper is useful in that it helps to smooth the transition between the warped and unwarped parts of your image, resulting in a more realistic effect. It also means that sometimes it's not necessary to create as many source/target shape pairs as you might think-a single shape pair's area of influence may be enough to create the effect you want. On the other hand, there are usually parts of an image that you don't want warped. For example, if you're warping someone's eyebrows, chances are you don't want his or her hair to be distorted as well. You exclude parts of an image from being affected by the Warper or Morpher node using boundary shapes. Chapter 27 Warping and Morphing Images 827