Question about "Adjustments" and "New Adjustment Layer"

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there 2 ways apply brightness/contrast command in legacy mode,
choose image > adjustments > brightness/contrast
or
choose layer > new adjustment layer > brightness/contrast

but found results different,
please view image here
http://www.flickr.com/photos/27955204@n08/3180949017/sizes/o/
why difference?

thanks!

"...why difference..."

what difference?

hex 7f7f7f (dec 127/127/127) equals, practical purposes,
hex 808080 (dec 128/128/128)


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