Please give me advices when to use black and white sliders in LR4.

Please give me advices when to use black and white sliders in LR4.

I use blacks and white sliders on every photo (this does not necessarily imply non-zero values). I consider them as important as any other slider. Not optional, not for fine tuning - include consideration each iteration.
Although that is contrary to what Adobe and many "experts" recommend, I tried doing it their way too but I could not get the results I wanted in most cases.
The "concept" and original intent is for fine tuning, but the implementation is not. I often set whites to +20, +30, +40. This has a radical effect on overall exposure which is the most important thing to get right in PV2012. And it generally requires compensatory adjustment of highlights, shadows, and sometimes contrast...
Likewise, optimal shadow toning can include radical blacks adjustment  - sorry Adobe/experts/defenders, but for me - it's true. And, blacks slider, like whites, affects entire histogram, a lot.
Summary:
========
If you want to keep things as simple as possible, then use sparingly and use last (gag), but if you want your photos to look how you want them to look - as good as possible, then use liberally, and pay the price...
More info here: http://forums.adobe.com/message/4259091#4259091
Rob

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