#122001/1/31 10:55:02
缩放过程中发生的帧画面不均匀插补产生的抖动可以用开启该层的frame blending,AE产生介于两帧间的模糊帧来使这中跳动得到缓解。
Enhancing time-altered motion by blending frames
When you time-stretch footage to a slower frame rate or to a rate lower than that of its
composition, movement can appear jerky. This jerky appearance results because the layer now
has fewer frames per second than the composition. By default, After Effects fills in the missing frames in slow-motion footage by repeating the last frame shown. After Effects can create a more gradual transition between frames by interpolating new frames in between existing ones.When you time-stretch or time-remap footage to a frame rate that is faster than the original or higher than that of its composition, After Effects skips many of the original frames to achieve the new rate and, consequently, movement can appear jerky. Frame blending combines the remaining original frames to create smoother fast motion.Using frame blending
Use the Frame Blending switch when motion already exists in the source footage for a layer,
such as people moving in live-action video. You can apply frame blending to a sequence of still
images, but not to a single still image. If you are animating a layer—for example, moving a layer of type across the screen
Frame blending slows previewing and rendering, so you might want to apply frame blending
without displaying it. By selecting the Enable Frame Blending button at the top of the Time
Layout window, you can control whether layers that use frame blending affect redraw and
rendering. The Quality setting you choose also affects frame blending. When the layer is set to
Best Quality, frame blending results in smoother motion, but may take longer to render than
when set to Draft Quality. You can also enable frame blending for all compositions when you
render a movie.