What are some ways of removing electric noise from digital pictures without using the flash?

Question

Thanks

Answer 1

Digital noise is usually caused by using very high ISO settings. Everyone seems to think that you have to use a high ISO to take night photos - and you do if you're photographing action. If, however, you're photographing night scenes such as a city skyline you can use a very low ISO - IF you have a tripod AND full manual control of your camera AND can use a cable release to control your shutter. If your shutter speed can be set to 15 seconds you don't need a cable release.

Having the Noise Reduction circuitry turned ON won't hurt.

Here are settings taken from my FotoSharp (fotosharp.com) Day & Night Exposure Guide for 'City skyline in distance':

ISO 100

f5.6 @ 15 seconds
f8 @ 30 seconds
f11 @ 60 seconds

ISO 200

f5.6 @ 8 seconds
f8 @ 15 seconds
f11 @ 30 seconds

Answer 2

You mean at capture time? Easiest is keep the ISO low, but of course in low light, you'll still get it.

The more light, the better.

In post processing you can use something like Noise Ninja or the Noise reduction filter in your photo editor. There are some fancy ways in Photoshop as well.