Noise reduction software such as Noise Ninja (and others) work quite
well. But you have to be prepared to expect some amount of image
softening. The software works by guessing what it is in the image that
represents noise. Although the guessing is very good there is a certain
amount of real image detail that gets "sacrificed" as noise. But the
detail that gets lost may not have been necessary in the first place if
you're not printing very large.
You can get an idea what happens by viewing both the low and high ISO
JPEG results seen from a shot of the same subject on your camera. Just
mount on a tripod and use a long shutter speed if necessary to
compensate for low ISO. Software such as Noise Ninja can do a much
better job than your camera but you will lose something.
<http://shutterbug.com/test_reports/0205noise/#>
<http://www.robgalbraith.com/public_files/photos/fullres/noise_ninja_mac_scrn.jpg>
Note: These are from old reviews and the products have probably
improved a bit.
Chuck Norcutt
John Hudson wrote:
> On the few occasions I raise the in-camera ISO rating to 1600 or beyond to
> capture images, especially of people, in poorly tungsten lit surrounding the
> images are invariably "noisy".
>
> To what extent can this noise be reduced using Photoshop to give the
> impression that the image was taken with lesser ISO rating?
>
> Not that "noise" has its place in people / portrait photography but my
> immediate preference is to reduce the evidence of same to a minimum.
>
> jh
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