Amount
Use the Amount setting to determine the amount of scratches applied to the image.

Depth
Depth determines the depth of the scratches. Scratches on film are made by rough edges in the recording or playback equipment and as such the Depth of a scratch is analogue to the pressure with which the scratches were made.
In effect, the depth determines how "clean" the cuts are and should be used as such. Use Transparency to fade out the effect.

Width
This sets the width of each individual scratch in pixels. Set this value higher if the scratches on the final rendered image appear too thin.
Please note that the line-width is not accurately previewed on any zoom mode other than 100%.

Transparency
This setting determines the actual visibility of the effect, setting it to any version higher than 0% will mix the scratches with the image.