LR4: Fringing/border of dark vs lighter background = blown highlights?

[dreed]

The attached image is a cutting from my screen with 100% view in LR4 Develop.

I don't understand why there is this red "fringe" or "border" where everything is highlighted as a "blown highlight".

Is this just a bug in Lightroom or is there some magic required?

[Bart_van_der_Wolf]

The attached image is a cutting from my screen with 100% view in LR4 Develop.

I don't understand why there is this red "fringe" or "border" where everything is highlighted as a "blown highlight".

Specular reflection from backlight? Sharpening halo?

You need to zoom in further and tell us what the RGB percentages are at such 'clipped' positions.

Cheers,
Bart

[Rendezvous]

Sharpening increase local contrast - maybe this has caused blown highlights in close proximity to the edges?

[dreed]

Specular reflection from backlight? Sharpening halo?

Possibly sharpening halo - reducing the radius to 0.5 reduced the effect but...

You need to zoom in further and tell us what the RGB percentages are at such 'clipped' positions.

Some of the red still remains and the values are nothing like what I would expect for clipping: 43.7/61.0/78.6 (for example)

Do the RGB %'s represent post-rendering or pre-rendering?