counting stops in Photoshop

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hi all!

I'd like your advice on this...

I need to raise the brightness of some images in photoshop exactly one f/stop.



How can i achieve this? 



I am thinking that there are 256 units between black and white, that's 16x16. So if we assume that there also 16 stops between black and white would moving the slider in the levels window 16 units, give mea 1 stop worth of difference?



just a moment I googled something out:

powerretouche.com/Exposure_plugin_tutorial.htm



Question still remains though, thanks, kostas
====================================================== 
so... no matter what, CHEER UP MY FRIENDS! Life is too precious to jump the other side of the fence... 
kostas papakotas / Clenched Teeth Photography 
http://groups.msn.com/clenchedteethphotography
http://groups.msn.com/clenchedteetharticles



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