8.7. Image Gradient

8.7. Image Gradient
	8. Filtres de détection de bord

8.7.1. Généralités

Figure 17.163. Applying example for the Image Gradient filter

Image d'origine

Filter « Image Gradient » applied with default options.

Filter « Image Gradient » applied with Direction option.

This filter detects edges in one or two gradient directions.

8.7.2. Activation du filtre

You can find this filter through Filters → Edge-Detect → Image Gradient….

8.7.3. Options

Figure 17.164. Image Gradient filter options

Pré-réglages, Aperçu, Diviser la vue

	Note
	Ces options sont décrites dans Section 2, « Options communes ».

Output mode

Magnitude is default: it combines both directions. Direction: only one direction is used. Both is like Magnitude.

Figure 17.165. Output mode examples

Original image, with abrupt luminosity change

Option Magnitude is selected

Option Direction is selected. In result, black is no edge detected, white is edge detected.

Clipping

The result of this filter can be larger than the original image. With the default Adjust option, the layer will be automatically resized as necessary when the filter is applied. With the Clip option the result will be clipped to the layer boundary.