![]() Use it if the sharpened image has too much "bite" at the finest level. ![]() It has the effect of preventing sharpening of the finest details. Find the right value through trial and error.Ĭontrols the blend factor between the unsharpened image and the sharpened one.ĭamping reduces the effect of the deconvolution at each iteration. The radius defines the standard deviation (sigma) of the Gaussian blur in the image. In reality, the blur produced by the lens and by motion may differ from Gaussian blur significantly, therefore some artifacts, such as halos, may appear when the radius diverges too far from the type of blur in the actual image, and when then effect is too strong. It uses the point spread function (PSF) to deconvolve (reverse) the effects of Gaussian-like blur. RL deconvolution is named after the makers of this algorithm, Richardson and Lucy. At 100 it works at maximum, reducing the visual impact of the USM filter. "Halo Control" is used to avoid halo effects around light objects when sharpening too aggressively. For low ISO (low noise) images use 1000 or less, for high ISO images use 2500-3000 or even more. It is very similar to the USM Threshold parameter and has a high impact on the visual quality.
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