8.7. Image Gradient

8.7. Image Gradient
	8. 边缘侦测滤镜

图 17.173. Applying example for the Image Gradient filter

Original image

Filter “Image Gradient” applied with default options.

Filter “Image Gradient” applied with Direction option.

This filter detects edges in one or two gradient directions.

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

图 17.174. Image Gradient filter options

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

	注意
	These options are described in 第 2 节 “Common Features”.

Output mode

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

图 17.175. 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.