Chalk and Charcoal

The Chalk & Charcoal effect draws the image onto a solid mid-grey background, translating the dark areas of the image into coarse charcoal strokes and the light areas into coarse chalk strokes.

By default, this effect produces a monochrome (grey-scale) image.

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. Charcoal Area Controls the size of the dark areas drawn with charcoal (foreground color).
Chalk Area	Controls the size of the light areas of the image drawn with chalk (background color).
Stroke Pressure	Controls the pressure applied to the charcoal and chalk strokes.
Background Color	Sets the color for background regions of the effect. Set a color using the sliders.
Foreground Color	Sets the color for foreground regions of the effect. Set a color using the sliders.