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Photoshop CS5 for Photographers provides comprehensive Photoshop training targeting the needs of photographers. In this course, author Chris Orwig demonstrates the fundamental skills used to enhance digital photos, including managing and correcting color, sharpening, making selections and adjustments, retouching, and printing from Photoshop. In addition to teaching the techniques that enable photographers to refine and publish their photos, the course includes live-action segments that encourage thinking photographically and shooting with Photoshop’s capabilities in mind. Exercise files are included with the course.
Another way that we can reduce noise is by analyzing the different types of information we have in the various channels. For example, if we navigate over to the Channels panel, here we can see the Red channel, the Green and also the Blue. Now when we click through these three channels, one of the things that you'll notice is the Red channel has the most problems. There is all these weird little spots in the background. Green is pretty clean, as is Blue. You'll also notice that in the Red channel it's obviously lighter for these areas, which are red or yellow, the skin and also parts of the motorcycle.
Well what we could do is actually apply Noise Reduction right on this channel, or we could also go back to the Composite view, go into the Layers panel and duplicate our Background layer. And we could do that by pressing Command+J or Ctrl+J. We'll name this one reduce noise. And next we can navigate to our Filter pulldown menu and here choose Noise and once again Reduce Noise, except this time what we are going to do is go to the Advanced options here. With the Advanced options, what we can do is we can dial in our overall Noise Reduction.
I'll go ahead and set up these settings so it looks good on my monitor at least. We can then go in to the different channels, for example, the Red channel. Remember that one with all of those different problems. And here we can control the overall amount in the Red channel or what percentage of the details we want to preserve. In particular, if we hover over this portion of the motorcycle you can see that it's doing a good job of cleaning up some of these details here in this portion the image on the reds, also on the red outfit there, and then of course in the background as well. So we can dial up the Strength, and you can see that it's going to target that particular channel.
You can of course go the other channels as well, and you could go ahead and reduce some noise there channel by channel. And viewing the channel here, it's kind of tricky. That's why I like to look at it beforehand. We can still see that it's definitely removing a lot of this noise. It looks really nice and now we can go ahead and click OK in order to apply that. So all that this does for us, if we zoom in a little bit is it does a little bit of a better job. Like the red here is a ton better than it was before. Also the background looks really nice, if we look at our overall before and then our after.
I know that's tricky to see on this compressed movies, so let me zoom in even further and let's look at our before and after. Here we have before, and then we have after. Not only clean up the sky but prioritizing that Red channel which in turn helped some of those red and yellow areas, and also helped the overall background, all of that blue sky as well. All right, so one of the things that you can do is start to look at those different channels in your Channels panel. At least start to analyze them and see where is the noise happening. And in different images you'll find it in different channels.
But it can then help you go to that filter and prioritize the channels that have the most problems, so that you can reduce the noise most aggressively in those most problematic channels.
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