Lightroom 4 - Banding/Posterization in shadows

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hi,

 

ever since upgraded lr4, i've noticed severe banding/posterization in shadow areas when using graduated filter reduced exposure or using vignette on amount -100.

 

i used these tools in lr3 create fade black areas in shots, have noticed now, instead of nice smooth gradient, hard black edge, green band stippled black before returning (in particular case) grey backdrop rather smooth transition black (like used lr3).

 

initially thought gfx card main 1 died , temporarily replaced older card. however, purchased nvidia geforce 630 replacement , it's still issue. exported file , viewed on partner's hp latop , issue still there.

 

i googled lr4 shadow banding try , find answers didn't have luck. 1 else experiencing issue, or have sort anomoly?

 

tech info::

windows 7 64bit

lightroom 4.1

dell 2408 wfp monitor

geforce gt630

spyder 3 calibration

 

any appreciated @ point i'm not sure whether it's system or lr4.

 

thanks in advance.

suggest posting screenshot shows banding , provide camera , file type (raw, jpeg) using.



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