The easiest way to add grain to a clip is to select a preset grain signature, add and fine-tune the grain, and then adjust the radius until you get the result you are looking for.

To add grain using a preset grain signature:

1. Enable View to see the View menu.

   Disable View to return to the ReGrain menu.

   
   

2. 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 hotkeys (Shift+R, Shift+G, or Shift+B) in the ReGrain 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 hotkey combination in the ReGrain menu to enable Excl. Use Shift+Z to restore the RGB view.

   
   

   (a) Channel Display buttons  (b) Exclusive button  

3. In the ReGrain menu, from the Grain Signature box, select the preset option corresponding to the grain signature that you want to add.

   Grain signature presets are indicated by four-digit names that correspond to the film stock from which their grain signature is derived. These signatures are based on a colour noise filter.

   
   

   (a) fstop field  (b) Grain Signature box  (c) View box  

4. To add grain to the clip, adjust the RGB Gain sliders:
   • Enable Proportional and drag the RGB Gain sliders to add grain proportionately to the Red, Green, and Blue channels.
   • Disable Proportional and adjust the R, G, and B channels independently to fine-tune the grain.
5. To compensate for under or overexposure, set the relative exposure offset by entering a value in the fstop field.

   The range of permissible fstop values is from -3 to 3. Set a positive value to compensate for overexposure or a negative value to compensate for underexposure. Values entered must be integers.

6. To adjust the radius of the grain along the X-axis, drag the RGB Radius X sliders:
   • Enable Proportional and drag the RGB Radius X sliders to add grain proportionately to the R, G, and B channels.
   • Disable Proportional and adjust the R, G, and B channels independently to fine-tune the grain radius.
7. To adjust the radius of the grain along the Y-axis, drag the RGB Radius Y sliders:
   • Enable Proportional and drag the RGB Radius Y sliders to add grain proportionately to the R, G, and B channels.
   • Disable Proportional and adjust the R, G, and B channels independently to fine-tune the grain radius.
8. When you are satisfied with the result, click Process to add grain to the clip or continue building your processing pipeline in Batch.