Adjusting Filters

Filters can be tailored to your specific needs by adjusting their parameters. The parameters can be adjusted in a number of different ways, such as using sliders in the HUDs and in the Inspector, by dragging onscreen controls, by adding keyframes, or by applying parameter behaviors.

Adjusting Parameters in the Inspector and HUD

Each filter has its own distinct set of parameters. These parameters can be adjusted in one of two places: the Filters tab of the Inspector or the filter’s HUD. As with all parameters in Motion, the HUD contains the most essential parameter controls for modifying a filter, whereas the Filters tab in the Inspector contains the filter’s entire list of editable parameters.

Both the HUD and the Filters tab reference the same parameters—changing a parameter in one automatically changes that parameter in the other. Frequently, the controls available in a filter’s HUD represent all parameters except for the position parameters. For example, compare the controls for the Fisheye filter in the Filters tab to those available in the HUD:

Figure. Inspector and HUD showing filter parameters.

Most filter parameters have only a single set of numbers that represent their value. Parameters with a disclosure triangle, however, may have additional numbers that represent a different way of describing the same value. In the case of the Center parameter, the numbers indicated in the value sliders are absolute values, but the X and Y values under the disclosure triangle represent percentages. If the defaults for X and Y are both 0.5, that represents the center of the image. Changing the percentages updates the absolute values in the value sliders.

For more information on accessing the Inspector and HUD controls, see Inspector and HUD.

In most cases, you interact manually with the parameters of a filter. The following image shows the Filters tab in the Inspector for the Hatched Screen filter. The Hatched Screen filter has six controls: Center, Angle, Scale, Skew, Stretch, and Contrast.

Figure. Inspector window Filters tab showing Hatched Screen filter controls.

Use the dial, slider, the value slider, or value field to set and enter values for each parameter as you see fit.

Important: Although the sliders are limited to a predetermined range of values, using either the value slider or the value field may often allow you to specify a parameter value outside of the slider’s range.

Using Onscreen Controls

Some of the filters have onscreen controls that manipulate certain filter parameters, especially position. As you use these controls, the associated parameters will update in the Inspector.

Keyframing Filter Parameters

Animating filter parameters is easy. The following section shows two ways to change a filter parameter over time using keyframes.

To animate filter parameters using Record
  1. Select the filter you want to animate.

  2. Click the Record button (or press A) to enable recording.

  3. Go to the frame where you want to add a keyframe.

  4. Change the value of the parameter to the desired value.

    A keyframe is automatically added with the value you select.

  5. Go to the next frame where you want a keyframe.

  6. Repeat steps 3 and 4 until you are finished.

To animate filter parameters using the Animation menu
  1. Select the filter you want to animate.

  2. Go to the frame where you want to add a keyframe.

  3. In the Inspector, click the Animation menu for the parameter you want to animate, then choose Add Keyframe from the menu.

    Figure. Animation menu for a filter parameter.
  4. Change the value of the parameter to the desired value.

  5. Go to the next frame where you want a keyframe.

  6. Repeat steps 3 and 4 until you are finished.

    Note: Remember to add a keyframe before adjusting a parameter value.

For more detail on using keyframes and the animation menu, see Animation Menu.

Applying Behaviors to Filter Parameters

Animating filter parameters is easy using Parameter behaviors. For example, if you have an object with an applied Circle Blur filter, you can randomize the amount of blur applied to the object over time.

To randomize the blur applied to an object
  1. Select the object with the applied blur filter.

  2. In the Inspector, open the Filters tab.

  3. Select the Amount parameter.

  4. Control-click Amount, then choose Randomize from the shortcut menu.

Figure. Behavior shortcut menu for a filter parameter.

The Behaviors icon appears in the Animation menu, and the Behaviors tab opens in the Inspector.

Figure. Behaviors icon in a filter parameter.

Adjusting the Amount parameter in Randomize changes the amount of variance between the random values. A small number causes small variations in the random values, and a larger number means larger variations in the values. For more detailed information about the Randomize behavior, see Randomize.

For more detailed information about all of the Parameter behaviors, see Parameter Behaviors.