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Dodging and burning are classic darkroom
techniques for darkening, or lightening, selective parts of an image.
Photoshop has a Dodge/Burn tool for this purpose. However, when you
use this tool, you are altering your original image. The following is
a technique that allows you to dodge/burn on a layer and leave the original
unchanged.
1) First create a new layer by holding the Alt key
while clicking on the “Create New Layer” icon on the bottom
of the Layers window.
2) The “New Layer” window will open. Change the Mode from
“Normal” to “Overlay”. Next, check the box at
the bottom “Fill with Overlay-neutral color (50% gray)".
Then click OK.
3) Make sure the colors in the tools pallet are set to black and white.
If not, click the little black/white button at the lower left corner
of the colors window. If you want to dodge (make a section lighter),
make sure you have white on top, if you want to burn (make a section
darker), make sure you have black on top. If you need to reverse the
position of the black and white, click the little reverse button at
the upper right corner of the colors window.
4) Now select a brush from the tools pallet. Set the brush size, and
brush edge softness to whatever you deem appropriate. Use the brush
tool over the area you wish to dodge/burn.
5) You can increase or decrease the intensity of the effect by adjusting
the Opacity and Flow at the top.
6) To view the impact, turn the adjusted layer on and off by clicking
the eye in the left of the “Layers” window for this layer.
7) If you don’t like the effect, you can delete the layer, and
start over. To delete this layer, right click on the name of this layer
(possibly Layer 1) in the Layers window, then select Delete Layer.
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