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This
method can be chiefly used when doing landscapes as this is where
the desired effect (darkening the sky and increasing color contrast)
can be reached best.
Click
the indicated icon on the Layers palette, and choose Selective
Color from the list.
Select
Relative at the bottom of the dialog, and apply the following
settings while selecting the appropriate color groups from the Colors
dropdown:
Reds
Cyan: 0
Magenta: +20
Yellow: 0
Black: 0
Yellows
Cyan: 0
Magenta: -30
Yellow: +25
Black: -10
Blues
Cyan: +100
Magenta: +100
Yellow: -10
Black: +100
Do
not modify the other color groups! Click OK when you're done.
Now you have a Selective Color layer that contains the color
settings specified above.
Now
click the indicated icon again and choose Brightness/Contrast
from the list. Set the following values on the dialog, and click
OK.
Brightness:
-5
Contrast: +5
Select
the appropriate layer and use Opacity on the Layers
palette to refine the effect. When you're ready, click Layer/Flatten
Image to merge the layers.
before
/ after
You
can download the above procedure as a saved action. It is free for
private use.
DOWNLOAD
Let
us stress once again that the procedure is far from the perfect
and only solution in all cases. Its usage may increase color noise.
If you really want to produce this effect, your best choice may
be investing into a real polar filter.
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