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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.
In other situations, you may discover that your images have noise due to the way that you captured and then processed the image. For example, here. Let's go ahead and double-click the Zoom tool, which will take this image up to 100%. Next press the Spacebar key and click and drag. And as you click and drag around the image one of the things that you'll notice is that there is a lot of noise in the background. There is also a lot of noise on the subject here. And this noise comes from the way the image was captured. It was under-exposed when I captured image. Therefore I had to boost the exposure, and I brought out all of this problematic noise.
When situations like this where noise is more global, it's throughout the entire image, one of the things that we can do is use a filter which allows us to reduce noise. Well, let's copy the background layer by pressing Command+J on a Mac or Ctrl+J on a PC. And let's name this new layer noise - reduction. Next, we'll navigate to our Filter pulldown menu. Here we are going to choose Noise. Then we are going to go ahead and select Reduce Noise. Now, this dialog is actually quite a strong dialog and what it allows us to do is as you can see, reduce the noise based on strength, preserving detail, color noise and also sharpening.
Well, let's take all of these sliders back to normal so that we can kind of deconstruct how this works. And let's zoom in on the image a little bit where we have some skin and also some background. Now, I know this gets a little bit tricky to see when these movies are compressed. Yet this is a higher-res file. So I'm hoping that you'll be able to see some of this, or you have to experiment on your own. Well, for starters, what Strength is is overall intensity. And Strength and Preserve Details are interrelated. So as I increase my Strength, I also am going to probably bring up my preservation of some of the details.
Now the Color Noise, we can see all the different color artifacts are really fascinating. In order to remove those, what's its going to do is look at all of these variables and then try to reduce all of that variation of color. Sharpen Details helps us compensate for the Strength and also the details that we're trying to preserve or lose for that matter. So a lot of times, when you are looking to reduce noise, what you are going to do is you are going to view your image at 100%. Not 300 as I've done here. So I'll zoom back to 100% so I can see how we are doing.
Click on the image, and then you'll be able to view a before. Let go, and you can view an after. You can also press the P key to toggle the preview on and off. All right. Well, in this case, I need a little bit higher strength of noise reduction, a little bit less details preserved, and also a little bit less of a sharpening here. I really want to get a lot of that noise out. Okay, well, I think that's looking much better. Click OK in order to apply that. And now we have our before and after that we can view inside of our layers. And again, this would be a little bit tricky for you to view in this compressed movie.
But nonetheless, I hope that this gives you at least a handle on how you can start to use this really powerful Reduce Noise filter, which is located inside of Photoshop.
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