Sharpens with an unsharp mask: adds amount times the difference between
the image and a Gaussian blur of radius pixels, where that difference is
at least threshold. Works on luminance, so colors do not fringe.
Transparent pixels are left as they are and do not darken or lighten their
neighbours.
Sharpens with an unsharp mask: adds
amounttimes the difference between the image and a Gaussian blur ofradiuspixels, where that difference is at leastthreshold. Works on luminance, so colors do not fringe. Transparent pixels are left as they are and do not darken or lighten their neighbours.