5.5. Sobel


This filter is found in Image>Filters/Edge detect/Sobel


Parameters Settings

  • Horizontally: Only near horizontal edges are displayed.

  • Vertically: Only near vertical edges are displayed.

  • Keep sign of result: (Only if one direction is selected): When this option is checked, opposite edges have opposite color (red-cyan, blue-yellow, green-magenta, black-white). With grey level images this results in a flat relief with bumps and hollows.