Reference

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unsharp

Arguments:

Description:

Apply unsharp mask on selected images.

Default values:

amount=2 and threshold=0.

Example of use:

$ gmic image.jpg blur 3 +unsharp 1.5,15 cut 0,255

Command: image.jpg blur 3 +unsharp 1.5,15 cut 0,255
Command: image.jpg blur 3 +unsharp 1.5,15 cut 0,255