8.6. Sobel

8.6. Sobel
	8. Edge-Detect Filters

8.6.1. Overview

Figure 17.161. Applying example of the Sobel filter

Original image

Filter “Sobel” applied

Sobel's filter detects horizontal and vertical edges separately on a scaled image. Color images are turned into RGB scaled images. As with the Laplace filter, the result is a transparent image with black lines and some rest of colors.

8.6.2. Activating the filter

You can find this filter through Filters → Edge-Detect → Sobel….

8.6.3. Options

Figure 17.162. Sobel filter options

Presets, Preview, Split view

	Note
	These options are described in Section 2, “Common Features”.

Horizontal

Renders near horizontal edges.

Vertical

Renders near vertical edges.

Keep sign

This option allows you to set how the filter will work if you have selected one direction for use only: a flat relief with bumps and hollows will be created.

Clipping

The result of this filter can be larger than the original image. With the default Adjust option, the layer will be automatically resized as necessary when the filter is applied. With the Clip option the result will be clipped to the layer boundary.