Applying the Sketch Effect

You can use the Sketch effect to convert an image to a black and white pencil sketch.

The Sketch effect.

To apply the Sketch effect
1
 
Select a layer or area of the canvas.
 
If you want to apply the effect to the entire image, do not make a selection.
2
 
Choose Effects > Surface Control > Sketch.
3
 
In the Sketch dialog box, adjust any of the following sliders:
 
Sensitivity - determines sensitivity to detail. Low values detect only the main edges. High values detect the main edges as well as thin lines, such as the lines around a person's eyes.
 
Smoothing - determines how much noise is filtered out. Higher values result in wider, lighter, and blurrier lines.
 
Grain - determines how much of the paper grain is revealed in the sketch marks. Move this slider to the right to show more of the paper grain.
 
Threshold - removes noise after edge detection. Threshold High is used to flag light pixels which may be just noise in the image. Threshold Low is used to test surrounding pixels.
 
If you want to save your settings as a preset, click Save and specify a preset name in the Save Preset dialog box.