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2 As you work in the Blur editor, select Action Context from the View box to preview the result.
3 Click Exit to return to Action. You do not have to click Render; the modifications are automatically
applied to the media in Action.
If you applied a blur type other than Gaussian, notice that the X and Y blur fields are not editable, and
display as black. If you switch to a Gaussian blur type in the Blur editor, and return to Action, you are
able to use the X and Y blur fields in the Media list (they display as white).
4 To mute a Blur effect, press Alt and click the white check mark in the media field. The check mark
turns black to signify the effect is muted. To unmute the Blur effect, press Alt and click the check mark
again.
Colour Corrector and Colour Warper
You can apply separate Colour Corrector and Colour Warper effects on Action media.
1 In the Media list, double-click the corresponding CC or CW field for your chosen media to enter the
Colour Corrector or Colour Warper.
2 As you work in the Colour Corrector or Colour Warper, select Action Context from the View box to
preview the result.
3 Click Exit to return to Action. You do not have to click Render; the modifications are automatically
applied to the media in Action.
4 To mute a CC or CW effect, press Alt and click the white check mark in the media field. The check
mark turns black to signify the effect is muted. To unmute the CC or CW effect, press Alt and click
the check mark again.
Divide
When compositing with images generated by rendering 3D objects over a black background, unwanted black
often appears on translucent or anti-aliased areas of the media. Use the Divide tool to divide the front media
by its associated matte media, which eliminates the black edges in the composite.
1 In the Media list, select the media containing the unwanted black.
2 Double-click the Divide field of the media containing the unwanted black.
The selected media's front is divided by its matte, resulting in correct colour in areas of transparency.
NOTE A blending premultiplication setting is also present in individual surface and geometry menus.
Crop
When you crop media, the front and matte clips are cropped together. You cannot crop the back clip. If you
applied the media to more than one surface, all the surfaces are cropped.
You can animate a crop by changing the size and shape of the Crop box at different keyframes. You can also
animate the softness of the Crop box.
NOTE Animating a crop in the Channel Editor does not enable the Crop field in the Media list.
To crop a clip with the Media list:
1 In Action, click Media.
2 Set values for cropping and softness in the Top, Bottom, Left, and Right fields. Once you set a value
in one of the Crop or Softness fields, white checkmarks indicate that Crop and Softness are enabled.
490 | Chapter 15 Compositing in 3D Space with Action