4.6. Sobel
| 4. Edge-Detect Filters |

### 4.6. Sobel

Revision History
Revision $Revision: 2440 $ | 2006-11-20 | j.h

#### 4.6.1. Overview

Figure 16.41. Applying example of the Sobel filter

Original image

Filter “Sobel” applied

You can find this filter through Filters → Edge detect → Sobel.

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.

#### 4.6.2. Options

Figure 16.42. Sobel filter options

Parameters Settings

  - Sobel Horizontally: Renders near horizontal edges.

  - Sobel Vertically: Renders near vertical edges.

  - Keep sign of result: This option works when one and only one direction is selected: it gives a flat relief with bumps and hollows to the image.

4.5. Neon |  | 5. Enhance Filters