Dodge & Burn not working on Rasterized Layer ?

hey                                                                                      level: newbie   os: windows 7 64bit  ps: cs6

 

 

 

so, have been playing around tools , trying know ps better. stuck issue dodge & burn tools.

 

i cannot seem either show on current project.

 

i have drawn out circle ellipse tool , filled color grey , added gradient overlay ... etc. please see screen shot below.

 

next wanted use burn tool when click on circle pop says layer must rasterized first. so, go ahead , rasterize layer.

 

however, when go use either tool effects aren't visible though listed under edit > undo having been used.

 

i have made sure opacity 100%, eye icons on , layers aren't locked.

 

i've searched faq's can't find these tools other photographic uses.

 

does have idea of doing wrong?

 

as always, thanx bunch , more time & efforts.

blending modes not show ojhn colors due underlying math resutling in no difference between original color , colro after operation. white, black , pure greys particularly affected that. since forgot include screenshot, nobody can certain, i'm sure it's that. dodge/burn require amount of contrast between neighboring pixels show up, using on gradient not effective way test them. use suitable photo instead.

 

mylenium

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