Mon 05-Nov-12 06:47 AM | edited Mon 05-Nov-12 06:49 AM by Antero52
Just like Alex said, clarity in ACR/LR is a modified unsharp mask sharpening. In normal USM you set a high amount and low radius. With the clarity adjustment the software sets a relatively low amount (compared with actual sharpening) and a high radius. It is the high radius that you see as the halo.
The halos are not directly related to the D800(E). But the fact you see the halos now can be indirectly linked to your D800E. With your former body you probably adjusted clarity until the dark areas were ruined by noise and/or lack of detail. The D800E holds shadow tones so well that you’re likely to push clarity much further than you did previously, and this is why the halos are visible. If you wish, you can use layer masking in Photoshop proper to get rid of the halos. One way to do it is like this:
1. Open your raw image as a smart object in Photoshop, without enhancing clarity (or even slightly reducing it), so that the sky is free from halos. 2. Duplicate the layer. 3. On the upper layer, adjust clarity as required. Now you see the halos. 4. On the lower layer select the sky around the bird (in the above example, almost any tone- or color-based selection tool will do). 5. With the selection active, select “Refine Edge” and adjust Feather and … size … (I don’t remember its exact name but it’s the lowest of the group, maybe Extend/Contract) until you see all sky selected and very little of the bird. Set output to Selection. 6. With the selection still active, select the top layer, and with the Alt key held down, click on the “Create Layer Mask” icon. Alt-clicking is equivalent to first inverting the selection and then creating a layer mask from the selection. Now the layer mask hides the sky from the upper layer (the one with the halos).
You may use “Refine Mask” until you’re satisfied that the halos are gone. When you’re done, you can do Layers / Flatten image.