5.5.  Sobel

5.5.1.  Overview

This filter is found in Filters->Edge detect->Sobel.

Sobel's filter detects horizontal and vertical edges separately on a grey-level image. Color images are turned into grey-levels.

5.5.2.  Options

Parameters Settings
  • Sobel Horizontally: Renders near horizontal edges.

  • Sobel Vertically: Renders near vertical edges.

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