Banding in the Layer Mask?

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hello,

 

i have:

 

windows xp service pack 3

4gb ram

geforce 560ti

ps cs5 extended

 

i photographer , submit images agency.they inspect images @ 100% technical quality.

 

while preparing image today, used layer mask in levels adjustment.i used brush 0% hardness , clicked once black color selected.but found severe banding.i alter clicked on layer mask , found same banding @ 100%.i have not noticed such thing till date.

https://dl.dropbox.com/u/42878955/1.jpg

 

i did try copy pasting layer mask show guys, when saved jpeg , viewed jpeg file, there no banding.however can see banding if view jpeg of image above.i tried on images same problem.it used smooth before.have made no changes default settings.tried both opengl on , off.

 

 

why happen?

have tried working in 16bit?



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