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By Mark S. Johnson
This technique is written for Photoshop CS4, but can easily be accomplished in prior versions using a few workarounds.
A polarizing filter is used in the field to darken blue skies and reduce glare and reflections on subjects. By reducing glare and reflections, subjects appear more saturated. A polarizing filter performs best when the sun is directly to the right or left of the photographer—in other words, when the sun is at a 90-degree angle to the subject. Whenever possible, use one of these filters in the field and don’t rely on Photoshop to darken blue skies and remove glare and reflections.
If you find yourself in a situation where you need to use Photoshop to mimic a polarizing filter, fortunately there’s a quick and simple Selective Color adjustment layer solution that does a great job of darkening and saturating blue skies. This method also makes it possible to darken and saturate water, which gives the appearance of reduced glare. The same principle that applies to skies and water also applies to darkening and saturating subjects such as damp autumn foliage. When it comes to removing actual reflections (rather than just glare), you enter the realm of retouching in Photoshop. I’ll save that tutorial for another day. Better still, if your goal is to make a reflection disappear, break out that polarizing filter while you’re in the field.
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