You can find this filter through
Filters->Edge Detect->Edge....
Figure 11.79.
Applying example for the Edge filter
Original image
After applying the filter (Sobel option)
Figure 11.80.
Applying examples for the Edge filter
After applying the filter (Prewitt option)
After applying the filter (Gradient option)
Figure 11.81.
Applying example for the Edge filter
After applying the filter (Roberts option)
Figure 11.82.
Applying example for the Edge filter
After applying the filter (Laplace option)
5.3.2.
Options
Figure 11.83.
Edge filter options
Algorithm
Edge detector offers several detection methods:
Sobel: Here, this method has no options
and so is less interesting than the specific Sobel.
Prewitt: Result doesn't look different
from Sobel.
Gradient: Edges are thiner, less
contrasted and more blurred than Sobel.
Roberts: No evident difference from Sobel.
Differential: Edges less bright.
Laplace: Less interesting than the
specific one.
Parameter Settings
Amount:
a low value results in black, high-contrasted image with thin
edges. A high value results in thick edges with low contrast and
many colors in dark areas.
Wrap, Smear, Black: These options are not
operational.
Published under the terms of the GNU General Public License
