My point was, that your kernel values were’nt exact enough for a sigma of 0.5
Ah, got it. Good thing I called it “strength” in the API… that could mean anything! 
For 1.0, I’m probably going to add USM to the tool or replace what I have with it. Then, I’ll treat it as a proper sigma…
Edit: tie to the thread - that’s one sharp seagull you have there, @heckflosse
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Trouble is we can see where you did that by the reverse gradient, esp. where it ends at the nape… and it isn’t just you.
RT:
D700_20090529_9255_R.jpg.out.pp3 (11.7 KB)
Shokingly similar to @heckflosse’s with the slight difference that he just used a curve and I used a ton of stuff. So if you want to learn how to be ineffective…download my pp3 file. 
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Here is somewhat faded look using RT 5.7.
D700_20090529_9255.jpg.out.pp3 (12.8 KB)
Nice shot! I’ve gone for what is perhaps an illustrative, brighter and more saturated look while trying to keep things within the bounds of reason.
darktable 2.6.2: D700_20090529_9255_01.NEF.xmp (9.1 KB)
I couldn’t seem to get the tones I was after with base curve and/or tone curve, which I was using as I’m not yet confident with Filmic. But I switched to Filmic and things fell into place quickly after some slider dragging. 
I found that darktable’s Defringe module helped a lot with the chromatic aberration(?) around the gull. Before and after:
I applied another instance with stronger settings to the tail with a drawn, feathered mask to get rid of more unwanted green and magenta.
Equalizer with a mask to bring out feather detail in the breast and head. And I’m a sucker for Soften (with substantially reduced settings as compared to the defaults!), which I applied to the inverse of the same mask.
Spot white balance on the breast, giving a warmer feel, and some good ol’ Velvia.
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D700_20090529_9255.NEF.xmp (25.4 KB)
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Darktable, then some GMIC sharpening on the feathers only and Liquid Rescale in Gimp to extend the canvas and put the eye at a “rule of thirds” crosspoint.
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A late contribution:
D700_20090529_9255.png.out.pp3 (11.5 KB)
RT 5.7dev and a good use of the wavelet levels tool.
I’m particularly pleased about the foreground sharpness without sharpening the blurred background.
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@Mike_Bing I enjoy a good liquid rescale. Good opportunity for one here.
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