Michael Young , Mar 21, 2010; 06:25 p.m.
This is really odd. See the attached composite image. The top half was sharpened in LR 2.6 and exported. The bottom has no sharpening applied. I understand about unsharp masking and complements of colors, and why this happens. Just wondering why I never noticed before. The onscreen appearance in LR varies depending on view magnification. It definitely is not simply a JPG artifact.
Sharpening Blues.
Michael Young , Mar 21, 2010; 06:26 p.m.
Reimporting into PS and viewing the exported JPG (above) at 1200%:
Reimported into PS, at 1200% view.
Tim Lookingbill 
, Mar 21, 2010; 06:34 p.m.
And what is it you're having an issue with?
Both ACR/LR only show true representation of sharpening and other edit tool application at 100% and above.
What's important is how it's going to print and as far as I can see it looks like it'll deliver.
Michael Young , Mar 21, 2010; 06:42 p.m.
And one more... This one is a 100% crop straight out of DPP. Color temperature and saturation probably doesn't match LR settings, Sharpness 10 in RAW conversion only.
Straight out of DPP.
Michael Young , Mar 21, 2010; 06:43 p.m.
Tim, I see a distinct blue shift to the detail in the sharpened image. You don't see it?
Tim Lookingbill , Mar 21, 2010; 07:08 p.m.
I see it, Michael, and I get that same hue shift effect as well on some of my images viewed in ACR.
I believe but not totally certain that this is a demosaicing algorithm/sharpening induced artifact. You'll note the blue in the demarcation lines doesn't show in the zoomed view crop you posted. Don't know why that is.
Which preview do you trust? As I said before, the print.
Tim Lookingbill , Mar 21, 2010; 07:13 p.m.
You might download and try out LR 3 Beta with its new and improved preview rendering demosaicing algorithm which might have fixed this.
Jeremy Stein 
, Mar 21, 2010; 07:16 p.m.
I was just admiring the nice old Pickett (?) slide rule - I still have half a dozen slide rules in my desk. After all, you never know when you might run out of batteries for your calculator!
Tim Lookingbill , Mar 21, 2010; 07:18 p.m.
Michael Young , Mar 21, 2010; 07:57 p.m.
Tim, I'm not sure where demosaicing and previews fit in the discussion. It seems clearly and strictly a sharpening artifact. Except for the PS screen shot, those are JPG exports, not screen previews. The first image shows portions of JPGs exported from LR of the same image. They were combined in PS CS and re-exported to post here. The only difference was sharpening. The blue'ish one, on top, was sharpened. The bottom half was not. LR3 shows the same behavior as LR2. DPP shows the markings correctly as black.
Jeremy: It's a Picket N4-ES. It apparently saw very little use before I acquired it and similarly didn't use it. I dug it out earlier as a gag, which seems to be their primary use these days.
