8.3. Edge

8.3. Edge
	8. Edge-Detect Filters

8.3.1. Activating the Filter

This filter is found in the main menu under Filters → Edge-Detect → Edge….

8.3.2. Options

شكل 17.162. Edge filter options

Presets, “Input Type”, Clipping, Blending Options, Preview, Merge filter, Split view

	ياداشت
	These options are described in قسمت 2, “Common Features” .

Algorithm

Edge detector offers several detection methods:

Sobel: Here, this method has no options and so is less interesting than the specific Sobel.

After applying the filter (Sobel option)
Prewitt compass: Result doesn't look different from Sobel.

After applying the filter (Prewitt compass option)
Gradient: Edges are thinner, less contrasted and more blurred than Sobel.

After applying the filter (Gradient option)
Roberts: No evident difference from Sobel.

After applying the filter (Roberts option)
Differential: Edges less bright.

After applying the filter (Differential option)
Laplace: Less interesting than the specific one.

After applying the filter (Laplace option)

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.

Border behavior

Where the edge detector will get adjoining pixels for its calculations when it is working on the image boundaries. This option will only have an effect on the boundaries of the result (if any). Clamp is the default and the best choice.