Graininess can make it difficult to pull a clean and effective key. With the Screen Degrain controls you can remove film grain, modify the size of the grain, and desharpen the edges of the key. The front image is not affected when you apply Screen Degrain to the Front input image.

To remove grain from the key in image using Screen Degrain:

1. Set a Player view to Tool Output and, with the selection on the Keyer super tool node, cycle to the A or Comp Output—see Cycling Through Inputs and Outputs.
2. Select Degrain from the Sample menu, or press D.

   

3. Sample a grainy area of the image. To sample a single pixel, click the image. To sample an area of the image, Ctrl + drag a selection box. Once the image is sampled, Screen Degrain is automatically enabled and grain is removed from the image.
4. Drag in the Screen Degrain fields to modify the grain size and restore edge sharpness.

   Use:	To:
   Enable	Enable the degrain algorithm.
   RGB	Enable RGB to degrain on all channels. The degrain algorithm is optimized for blue screen degraining.
   Grain Size	Estimate the size of the grain in the image.
   Edges	Unsharpen the edge of the image. By default, Degrain sharpens the edges. Use the Edges field to restore the natural look of the edges in the image.

5. If you are not satisfied with the result, you can start over with a new sample, and then adjust the Screen Degrain fields. To resample an area of the image, Ctrl + Alt + drag the image.
   NoteYou can also reset Screen Degrain parameters. To reset Screen Degrain parameters, click the Reset button under the Screen Degrain UI.
6. If resampling the image and adjusting the Screen Degrain fields does not sufficiently remove grain, select RGB to increase the overall effect of Screen Degrain.