RustyBug Offline Upload & Sell: On
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I'm not familiar with Nik, but I suspect that your detail extractor combined with a 3.1 radius is likely your culprit.
Using a classic HIRALOAM (High Radius, Low Amplitude) similar to what Karen uses @ 16, 60, 0 (iirc) and a finely detailed radius of .3 or .2 with large amplitude (often following HIRALOAM) can be useful depending on the structures in the image. The blue sky and the grasses are very opposite structure, so a different sharpening radius has a different impact.
To me, a radius of greater than one (file size dependent) can be responsible for the crunchies until you get large enough (HIRALOAM) that they can smooth out (such as the sky). 3.1 seems like a "no man's land" for much of what I've worked on, unless you are using very large files.
The main point here is that sharpening for well defined edges (grasses, roof lines) can be a diff thing from sky, cloud transitions. Similar applies to hair vs. skin ... diff structures = diff sharpening.
The subject matter of sharpening can be voluminous of its own. More than one way to skin the cat, but I'd suggest a good book followed by some testing of diff structures will be helpful to garner a better understanding.
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