According to my knowledge Polarizing filters are mainly used to make sky appear more bluish in the day sunlight which gives more dramatic effect to your pictures.
I don't have polarizing filters yet , But would like to know whether we can achieve same effect(making sky more blue like a polarizing effect) through post processing. If yes any link which explains it from scratch ?
I use GIMP and picasa (open source) in Ubuntu . Any easy solution using these Softwares ? or is it better to buy a polarizing filter itself !
I use Canon EOS 1000D , and mostly use 50mm 1.8 and 70-300sigma lens.
Answer
One result of using a polarizer is the deeper blue skies; that effect isn't hard to replicate using software such as Photoshop, Lightroom, Picasa, or the GIMP.
Another important reason a polarizer might be used is to reduce glare and reflections. The best example of this is if one is photographing a puddle or pond; without a polarizer the surface will reflect the sunlight and result in a lot of glare whereas a polarizer cuts down on that glare and the camera will capture an image that shows some underwater detail.
The second effect (removing glare) is not one that can be replicated in post-processing and requires a polarizer to get it right at the time of capture.
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