I kept strugling with the amount of effort this technique, when 90% of the image didn't need any such adjustments... and the painting technique Boo shared was looking like it was much easier, except for the picking the right colors, etc...
So I got to thinking... Using this inverted overlay area with inverted mask, I wish i could just paint in the areas I want to be brightened, but still keep things to the point where any non artistic person (somewhat like myself) could do easily...
Then I figured it out....
Duplicate the background layer, desaturate it, invert it... For discussion sake lets call this the 'B&W_negitive' layer. This layer will not be visable in the final image, it's merely used as a source for cloning into the next layer...
Create a new blank layer with a 'overlay' blending mode, lets call this new layer 'highlighter' , add a mask to it. Copy the desaturated/inverted layer from previous step into the mask area for this 'highlighter' layer.
Now the magic part...
Use the clone stamp ... with a soft sided brush shape, normal cloneing mode, algined, not using all layers, and 100% opacity... Choose a source point from the 'B&W_negitive' layer, noting the exact point you choose using the rulers. Then go back to the 'highlighter' layer and start cloning, being careful to start with the exact same point (using rulers to find it). You can make the 'B&W_negitive' layer so that it doesn't show in the image at this point... Now just use your clone tool to go 'clone' the areas you want highlighted. If you make a mistake, use the eraser tool to get rid of the parts you accidently cloned in... (again a eraser with a soft sided brush shape works best)
Note, the mask of the highlighter area reamains a exact copy of the 'B&W_negitive' layer... you don't modify this mask at all once it's in place. You only clone into the main part of the 'highlighter' raster image area...
This method is pretty darn close to fool proof for lightening up shadowy areas... You can adjust the opacity of the 'highlighter' area as desired... You only clone the areas you need highlighted... (so it's extremely localized highlighting).... Only takes minimal artistic skills and can be pretty easily corrected if you make a mistake, by clone the wrong spots... The only tricky part is getting the cloning source in the 'B&W_negitive' layer, to line up exactly with the target spot in the highlight layer... but that's not really that hard when you use the rules...
duplicate/desaturate/invert/overlay is a classic and very useful
for recovering shadows. The best thing about it is the shadow color
is better compared to other methods (IMO)
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http://www.pbase.com/thejaybird