Freezing your Roto Brush tool results

You’ve put a fair amount of time into creating the segmentation boundary across all the frames in this clip. After Effects has cached the segmentation boundary, so it can recall it without having to make the calculations again. To keep that data easily accessible, you’ll freeze it. This reduces the processing demands on your system so you can work faster in After Effects.

Once the segmentation is frozen, you cannot edit it unless you unfreeze. Refreezing the segmentation is time-consuming, so it’s best to refine the segmentation boundary as much as possible before freezing.

1 Click the Freeze button in the lower-right area of the Layer panel. The Freezing Roto Brush dialog box displays a progress bar as it freezes the Roto Brush tool results. Freezing may take a few minutes. As it freezes the information for each frame, the cache line turns from green to blue. When it has finished freezing, a blue warning bar appears above the time ruler in the Layer panel, reminding you that the segmentation is frozen.

2 Click the Toggle Alpha Boundary button () in the Layer panel to see the matte. Then click the Toggle Transparency Grid button (). Move the time marker across the time ruler to see the flamingo move without the distraction of the background.

3 Choose File > Save. After Effects saves the frozen segmentation information with the project.

Дата добавления: 2014-11-20