When you reduce the effect of noise in a program like photoshop

1. How effective is it in reducing noise?

2. What are the undesireable things it does when noise it reduced?

David J Taylor wrote:

measekite wrote:
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All of the sample shots I find are ISO80. I would like to see the
same shot at ISO 80,200,400.



I suggest you borrow a camera from a photo store and take pictures for
yourself, as we seem to have established that the camera is basically OK
for you. Also be aware that as already mentioned you can reduce the
effect of noise in an image with programs like Neat Image, Paint Shop Pro
etc.

I really wouldn't get hung up on this - if you want low noise from a small
sensor camera stick with low ISO, and if you need low noise and high ISO,
buy a DSLR.

Cheers,
David