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Excerpt

The unsharp mask action allows unsharp masking based on the specified amount, radius and threshold. The following values need to be defined: Amount of 1 to 500 percent, Radius of 0.1 to 1000.0 Pixel and Threshold of 1 to 255 levels.  


PropertyValueDetails
kindUnsharpenMaskAction

amount

Amount of 1 to 500 percent.Unsharp mask amount (the difference between blurred and original image).
radiusThe radius of 0.1 to 1000.0 Pixel.Blur radius used to produce an unfocused version of the image.
thresholdThe threshold of 1 to 255 levels.

The threshold value for the unsharp mask in the range [0, 1]