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Outputting from a BFX Output Node

Outputting from a BFX Output Node

Example: Working with a Matte and RGB Result in a BFX Level

 

Batch Processing > Batch FX > Outputting from a BFX Output Node > 

Outputting a Matte to the Timeline

Output a matte in addition to the RGB result from a BFX output node. You connect the RGB result to the front input of the BFX output node, and the alpha result to the matte input of the BFX output node. Both results are fed directly to the timeline. To enable the matte, you apply an Axis or a Sparks soft effect to the segment.

Alternatively, you can have an Axis soft effect automatically added on output. Enable the Add Axis On Matte Output button in the Timeline section of the Preferences menu.

To output a matte from a BFX output node:

1. Enter a BFX level and create a matte. Connect the RGB and alpha outputs to the BFX output node.

   In the following example, a basic matte is created with a Keyer node. The blue tab on the BFX output node receives the alpha result and the red tab receives the RGB result. The background is not considered when you output the matte back to the timeline.

   
   

   (a)  RGB result goes to front input tab  (b)  Alpha result goes to matte input tab

2. Select the BFX output node and press F4 twice to display the matte and refine as needed.

   
   

   Image courtesy of The House

3. If you want to output the matte to the desktop in addition to the timeline, add an Output node. Connect the Keyer outputs to the red and blue tabs of the Output node.
   Note

   The matte input of the BFX output node outputs the matte only to the timeline.

   
   

   (a)  Front input tab of Output node (b)   Matte input tab of Output node

4. Exit back to the timeline.

   The BFXA icon indicates that the segment contains a matte. In the following example, the matte is not yet enabled (the Add Axis On Matte Output button is not enabled in the Preferences menu).

   
   

   (a)  Matte BFXA icon

   Image courtesy of The House

5. Add a soft Axis to the matte segment and a background layer to the timeline.
   NoteTo have the Axis soft effect automatically added when you exit back to the timeline, you can enable the Add Axis On Matte Output button in the Preferences menu at any time.

   The matte output results from the BFX output node are composited over the background layer of the timeline.

   
   

   (a) Result of matte from BFX output node keyed over timeline background layer (b) Timeline background layer (c) Axis soft effect

   Image courtesy of The House

6. Process and exit to the desktop.

   The matte clip and the result of the matte composited over the timeline background are processed from the Output node to the desktop. The matte clip has _alpha appended to the clip name.

   
   

   (a)  Matte clip (b)   Result clip

   Image courtesy of The House