You can fine-tune grain removal by changing the spatial degrain parameters in the Degrain Settings panel.

The Degrain Settings menu is made up of the following elements.

Red slider Sets the gain for red channel colour values.

Green slider Sets the gain for green channel colour values.

Blue slider Sets the gain for blue channel colour values. For film scans, the grain is often greater in this channel.

Link button Click to change gain values proportionally for all three colour channels.

Grain Size slider Sets a value in pixels that is proportional to the size of the grain. The default value is 3, but may be higher for 4K images.

Smoothing Radius slider Sets the blur radius. For smoother results, a higher value will add more pixels to the blur, but increase processing time.

Detail slider Sets the amount of detail to preserve when the Smoothing Radius is set to a high value. It is recommended you enter 0.05 to 0.15 as an initial value.

Opacity slider Sets the level of opacity between the source image and the output with the applied grain filter.