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Edge Detection

ID:

7118

Product:	SnagIt
Platform:	Win 98 and above
Version:	7 and above

The Edge Detection menu offers you a variety of options for gradient or Laplacian edge detection. Place your cursor over the Edge Detection menu option and a fly-out menu will appear. Click to select the option you wish to use.

Upon selection of most of the effects, an additional preview window will appear. You can use the list box to choose the direction of the effect. After adjusting the sliding bar, you can choose OK to change the image or Cancel to reject the change.

These effects can also be applied to just a region of the image. Use the cursor to select a region of the image, and then apply the effect.

Applying Edge Detection Effects from within the Preview Window

Note: These effects can be applied to a region of the image. Use the cursor to select a region of the image, and then apply the effect.

Select an image in the Preview Window.
Select Effects > Edge Detection. A fly-out menu shows additional choices. Click to select the effect you want to use.
Adjust the sliding bar if needed. (Edge Enhance works automatically, Underlay asks you to select an image to underlay, and Emboss asks you to select a direction.)
Click OK.
Choose Finish to direct the image to the desired output.

Edge Detection Options

To access Edge Detection options, from within the Preview Window choose Effects > Edge Detection. A fly-out menu appears, from which you can choose the desired effect.

The following table describes each of the Edge Detection Effects menu options.

Option	Description & Use
Gradient	Detects edges, starting from one of eight specified directions. All pixels not on the detected edges are changed to black.
Laplacian	Detects lines. There are three omni-directional filters and three bi-directional ones. All pixels not on the detected lines are changed to black.
Sobel	Detects horizontal or vertical edges. All pixels not on the detected edges are changed to black. (The use is the same as Prewitt, but the algorithm is different.)
Prewitt	Detects horizontal or vertical edges. All pixels not on the detected edges are changed to black.
Shift and Difference	Detects horizontal, vertical, or diagonal edges. All pixels not on the detected edges are changed to black.
Line Segment	Detects line segments. Possible directions are horizontal, vertical, left-to-right diagonal, and right-to-left diagonal. Use this filter to find line discontinuities in an image. All pixels not on the detected line segments are changed to black.

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