Parameter

Description

Sharpen

Select how to improve the sharpness by enhancing contrast at fine structures and edges of the image before the threshold values are set. The following methods are available:

-

None

No sharpening algorithm is applied.

-

Delineate

Applies the Delineate method. It emphasizes edges around structures in an image, which is useful for images where the gray value range of structures differs clearly from the gray value range of the pixels around them.

-

Unsharp Masking

Applies the Unsharp Masking method.

Threshold

Only visible, if you have selected Delineate.
Sets the threshold value for edge detection. The threshold value should correspond roughly to the gray value difference between objects and the background.

Size

Only visible, if you have selected Delineate.
Sets the size of the edge detection filter, i.e. the size of image details which are enhanced. The smaller the Size value is, the finer are the details affected by the tool. The value should correspond to the size of the transition area between objects and the background.

Strength

Only visible, if you have selected Unsharp Masking.
Sets the strength of the Unsharp Masking. The higher the value selected, the greater the extent to which small structures are enhanced.