Smudge Stick

The Smudge Stick effect uses short, diagonal strokes to smudge or smear the darker areas of the image. Lighter areas of the image are pushed to a brighter range.

Name	Specifies the operator's name.
Opacity	Sets the opacity of the effect over the input image. A value of 0 makes the effect completely transparent, while a value of 100 makes it completely opaque.
Use Alpha As Mask	Uses the input image's alpha channel as a mask for applying the effect. The effect is fully applied to areas of the image where the alpha channel is white, and not at all to areas where it is black.
Run Effect On	Enable the RGB and/or Alpha options to specify whether the effect is applied to the RGB channels, the Alpha channel, or both.
Stroke Length	Set lower values to shorten the stroke length, or set higher values to increase the stroke length.
Highlight Area	This control sets how much of the original image becomes white; that is, how much of the image is moved into the highlight range. Set lower values to decrease the areas going to white, or set higher values to increase areas going to white.
Highlight Intensity	This control adjusts how much of the brightened image is blended into the original image. Set lower values to increase the transparency of the brightened image and let more of the original image show through. Set higher values to increase the opacity of the brightened image and let less of the original image show through.