#1. "RE: Filter vs Software?" | In response to Reply # 0esantos Nikonian since 10th Nov 2002Wed 05-Oct-11 01:54 AM
Although a warming effect can be accomplished with adjustments to the white balance of a raw file, a polarizing effect would be very difficult if not at all possible. You have to bear in mind that the primary use for a polarizer is to reduce glare which can be presented in a myriad of ways, from specular highlights, to glare, strong reflections, and haze to some degree. Some believe that a polarizer increases saturation but in reality colors become more saturated due to the elimination of the glare. As far as a star effect I have seen some software effects that can do this but I have never really been impressed. Again I think an actual filter would give you the best results.
#2. "RE: Filter vs Software?" | In response to Reply # 0Len Shepherd Nikonian since 09th Mar 2003Wed 05-Oct-11 10:44 AM
Some warming pols are lower grade at a price premium.
I think it is better to buy a good none warming pol, and to use the camera menu options or post processing when you want a warmer effect.
Photography is a bit like archery. A technically better camera, lens or arrow may not hit the target as often as it could if the photographer or archer does not practice enough.
#3. "RE: Filter vs Software?" | In response to Reply # 0ericbowles Nikonian since 25th Nov 2005Mon 17-Oct-11 12:17 PM
A circular polarizer cannot be duplicated in software for the reasons Ernesto described. There are polarizing effects that saturate color and remove some reflections, but they are limited in usefulness.
Now if you use a CP to manage reflections, I have seen some benefit to using the CP filter in software to add saturation - particularly to blue skies. One benefit of using software is that blue skies are more even than they would be with a wide angle lens. You can also add saturation beyond what a CP alone can accomplish - which can be useful on slightly hazy days.
Now a Warming CP is a bit different. It adds a slight warming tone to your images in addition to polarizing. It is probably better to replicate the warming effect in post processing by adjusting white balance. In fact, if you use Auto WB, the camera will do its best to neutralize the warming effect.
Nikonians membership my most important photographic investment, after the camera