Quartz Composer Layer - Core Animation - page 156

To add a filter to the compositions :

1. Open the Quartz Composition file in Quartz Composer, and drag a Dot Screen
patch from the filters in the Patch Creator list to the editing area.

2. Drag the Image output of the second Movie Loader to the Image input of the Dot
Screen patch.

3. Drag the Image output of the Dot Screen patch to the Image input of the second
Billboard patch.

Your composition should now look like what you see in Figure 9-3.

FIGURE 9-3 Composition with Dot Screen Patch

Now we need to publish the Image output for the Dot Screen patch so that we can obtain
the current image with the filter applied at any time during the video playback. To
publish the Image output of the Dot Screen patch, follow these steps:

1. Control-click the Dot Screen patch.

2. Select Published Outputs > Image .

3. Name it dotscreen_image and press Enter.

4. Save the composition.