### 8.6. Sobel

#### 8.6.1. Overview

Figure 17.177. Applying example of the Sobel filter

Original image

Filter 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

This filter is found in the main menu under Filters → Edge-Detect → Sobel….

#### 8.6.3. Options

Figure 17.178. Sobel filter options

Presets, “Input Type”, Clipping, Blending Options, Preview, Merge filter, 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.

8.5. Neon |  | 8.7. Image Gradient

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