User guide

676 | Corel Painter 2015 User Guide
Applying the Sketch effect
You can use the Sketch effect to generate a black and white pencil outline of a photograph. You can then
use the outline as a guide for applying color, which is a useful technique for starting a painting. For more
information, see “Choosing a painting workflow” on page 124.
To store the settings for the effect, you can create a preset. This allows you to quickly apply the settings to
another image.
Before (left) and after (right) applying the Sketch effect.
To apply the Sketch effect
1 To apply the effect to:
• The canvas — Click the Canvas in the Layers panel.
• A selection — Click a selection tool from the toolbox, and drag in the document window to select an
area.
• A layer — Click a layer in the Layers panel.
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 High and Threshold Low — 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.