Effects > Keyer > Creating and Refining a Key > 
Removing Grain
 
 
 

Graininess can make it difficult to pull a clean and effective key. Use the Degrain tools in the Master Keyer to remove grain from clips.

The same Degrain tools are also available in the Keyer's Setup menu. If you set the Degrain parameters in the Master Keyer, they affect only the Master Keyer. If you set the Degrain parameters in the Keyer's Setup menu, they affect all the Keyer's ranges, including the Master Keyer. See Blurring Grainy Clips.

NoteDegrain parameters are animatable. Degrain samples are also animatable and appear in the Channel Editor as the Degrain_Matrix channel, located in the Key_Degrain folder. See Creating Animations.

To remove grain:

  1. In the Master Keyer menu, select Degrain from the Sampling box (or press 4).

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  2. Set the view to Result view.

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  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.

    The Degrain button is enabled and the algorithm is applied to the image—grain is removed from the image.

    NoteThe Degrain button is either enabled or disabled for the entire clip—you cannot turn it on and off for different frames in the clip.
  4. Drag in the Degrain fields to modify the grain size and restore edge sharpness.

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    (a) Size field  (b) Edges field  

    Drag: To:
    Size Estimate the size of the grain in the image.
    Edges De-sharpen 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 Degrain fields. To resample an area of the image, Ctrl+Alt-drag the image.

    The sample is outlined in green, indicating that you are resampling the image.

    NoteYou can also reset Degrain parameters. To reset Degrain parameters, click the Reset button, next to the sampling box.
  6. If resampling the image and adjusting the Degrain fields does not sufficiently remove grain, enable More to increase the overall effect of Degrain.
    NoteThe More button is either enabled or disabled for the entire clip—you cannot turn it on and off for different frames in the clip. When you enable More, processing speed slows down.