You can adjust the "Strength" individually on separate channels by selecting "Advanced", but I don't want to do that, so I won't. I'm going to click "OK" to apply the filter.



Here's the result of the "Reduce Noise" filter. It did a good job of reducing the noise, but it also reduced some of the details. Unfortunately, it's a tradeoff. Later in this tutorial, I will show you how to selectively apply the "Reduce Noise" or any other filter.



If you don't have Photoshop CS2, don't worry. There's a couple of filters included with other versions of Photoshop you can use to reduce noise. The "Dust & Scratches" filter is one of them. To access it, go to the "Filter" menu, scroll down to "Noise" and slide over and down to "Dust & Scratches".



The following dialog box will pop up. Adjust the "Radius" setting to remove noise. Usually 1 or 2 pixels is enough. If you go too far, you will really blur the image. I'm going to choose 2 pixels for the "Radius" setting and leave the "Threshold" at 0 and click "OK" to apply the filter.