Charcoal

The Charcoal effect draws the image onto a surface that resembles rough, textured paper. Strong edges are drawn boldly, while midtones are sketched with a diagonal stroke.

By default, this effect produces a monochrome (gray-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 Thickness	Controls the thickness of the charcoal lines.
Detail	Lower values create a less detailed image, while higher values create a more detailed image.
Light/Dark Balance	Controls the balance between background and foreground colors. Lower values increase the proportion of the whit background color, while higher values increase the proportion of the black background color.
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.

Except where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License