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.
| ![[Bemærk]](images/note.png)  | Bemærk | 
|---|---|
| Disse indstillinger er beskrevet i Afsnit 2, “Fælles funktioner”. | 
Renders near horizontal edges.
Renders near vertical edges.
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.