lightroom 4 5dmkIII raw now supported download the release candidate here

[AnselA]

The latest info on what bugs remain in the 4.1 RC can be found here:

http://blogs.adobe.com/lightroomjournal/

and here

http://feedback.photoshop.com/photoshop_family/topics

and here:

http://feedback.photoshop.com/photoshop_family/topics/lr4_deleted_all_my_tone_curve_adjustments#

[EvilTed]

Here are two histograms from LR4 showing the effect of lens correction on the 50mm F/1.8.
The rest of the settings are unchanged and the CA checkbox has no effect.

Why would fixing the lens for what should be vignetting or barrel/pin cushion distortion change the histogram in this manner. It doesn't make sense to me?

ET

[msdarkroom]

Vignetting is a darkening of the non-center portions of an image. Correction of this, by definition, would make the image brighter. That is what you are seeing on the histogram.