Removing Grain from a Clip
 
 
 

Use the DeGrain command to remove grain from a clip. DeGrain applies a noise reduction algorithm that consists of two filters:

When you remove grain from a clip, you start with the default values for these filters and adjust them to produce the degrained result that you need.

Because grain varies according to film stock, lighting conditions, colour, and resolution, it is advisable to create a DeGrain setup for each clip from which you want to remove grain.

To access DeGrain from the EditDesk:

  1. From the A/V Tools box, select and enable Film, then click DeGrain.

    Show small imageShow large image

  2. Select the clip from which you want to remove grain, and then select the destination for the processed clip.

    The DeGrain menu appears.

    Show small imageShow large image

    (a) View box  (b) Render Method box  

  3. Optional: Click Reset All, and then Confirm, to reset DeGrain to the default settings.

    Show small imageShow large image

  4. By default, the result clip appears. You can also view the front clip by selecting Front from the View box.
  5. To view the front and result clips simultaneously, and to speed up interactivity while defining the DeGrain parameters, enable the Crop button and use the crop box. See Defining the DeGrain and ReGrain Area.

To remove grain from a clip:

  1. Select an option from the Render Method box.
    Select: To:
    Progressive Remove grain from frame-based material, including film-based material transferred either to PAL without field interpolation, or to 30 fps field-based formats, provided 2:3 sequence has been removed.
    Interlaced Remove grain from field-based video, thus compensating for temporal jitter between fields in each frame.
  2. Enable View.

    Show small imageShow large image

  3. In the View menu, use the R, G, and B buttons to control the display of the corresponding channels in the image window. You can also use the corresponding hot keys (Shift+R, Shift+G, or Shift+B) in the DeGrain menu. Enable Excl and then click R, G, or B to view each channel exclusively as a greyscale representation. You can also use the Shift+X hot key combination in the DeGrain menu to enable Excl. Use Shift+Z to restore the RGB view.

    Show small imageShow large image

    (a) Channel Display buttons  (b) Exclusive button  

  4. Set the RGB Average Blur radius to remove the grain from the clip:

    Show small imageShow large image

    (a) RGB Average Blur controls  (b) RGB Adaptive Sharpness controls  

  5. Set the RGB Adaptive Sharpness radius to restore sharpness where it is needed:
  6. When you are satisfied with the result, click Process to remove grain from the clip.