8.61. Local Threshold

8.61.1. Activating the Filter

This filter is found in the main menu under Colors → Local Threshold….

8.61.2. Options

图 16.233. “Local Threshold” filter options

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

	注意
	These options are described in 第 8.1.2 节 “Colors Common Features”.

Radius

Standard deviation of gaussian neighborhood average for computing local contrast. If 0 is used a global threshold is used instead of one based on local contrast.

Antialiasing

This sets a rough target of levels of accuracy for anti-aliasing, or set to 1 to disable anti-aliasing.

Threshold level

Thresholding level consists of two values. Change the lower threshold towards 0 to minimize shadows or towards 1.0 to minimize highlights. The high threshold decides the maximum values to include, above this it gets set to 0.