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.
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These options are described in Section 2, “Common Features”. |
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.