Figure 16.146. Applying example of the Sobel filter
Original image
Filter “Sobel” applied
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.
7.6.2. Activate the filter
You can find this filter through
Filters → Edge detect → Sobel.
7.6.3. Options
Figure 16.147. Sobel filter options
Preview
If checked, changes in the image are displayed in the Preview in
real time before being applied to the image.
Sobel Horizontally
Renders near horizontal edges.
Sobel Vertically
Renders near vertical edges.
Keep sign of result
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.
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