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Let's take a look at the Sharpness and De-noise sliders here in the Adjust pane, and we'll go to Full Screen mode because I've got two images up. We're going to look at sharpness here, and then we'll use this shot for looking at noise and what to do about it. Now, I'm going to be honest with you, these are not my two favorite sliders in iPhoto. I think their implementation could be better but let me show you that. I mean, it's-- I could ramble on about that for some time and I think I can.
A picture is worth so much Derrick yacking. So I'm going to zoom-in on this shot a bit. You can just put the mouse where you want and click the 1 key and you go to 100%. Let's play with Sharpness. So we're just going to move Sharpness over and you can see what it does to this image. I'll hit the Shift key and you can see the difference. Now here's the reason why I don't like this particular Sharpening filter very much because look at the sky.
I mean when you want to sharpen something, you want to sharpen objects but you don't want to sharpen the sky because when you sharpen the sky what you get is noise. You can see how it increases the noise in the sky, and you also increase chromatic aberration here and it's just not very elegant. So, my advice is, let's zoom-out so you can also see it that way, which is you want to look at Sharpness at 100% and then at normal view. So now we can look at this way and then we can hit Shift and you can see the difference.
This is too sharp. This creates artifacts. So my recommendation is if you're going to use the Sharpness filter in iPhoto, be modest, take down here, show restraint. Keep it low so that you don't introduce noise and you don't introduce artifacts. Okay, now let's look at some noise. So we will go over here, and I will just put my mouse right here and we'll go to 100%. Let's go to 200%. So I hit the 2 key and this is all noise here, okay? This graininess that you see.
Now this here, this is called chromatic noise, this color noise. And again, this happens in the dark areas usually of shots that are recorded at higher ISOs. 800, 1600, up around that neighborhood. It's not necessarily a bad thing. When you make a print, sometimes noise just kind of adds a bit of subtle texture. But in order to illustrate how De-noise works, we're going to blow it up to 200% and then I am going to slide the slider, and you can see that it does reduce the noise.
I am going to hit Shift, there it is before De-noise, and here it is afterwards. Now sometimes what you have to look out for with noise reduction is what we call smearing, where you start to lose some detail also. So again, you want to be careful with this and remember you're not going to be looking at your shots at this high magnification. So you can move them down like this. Here's some noise here. We're at 100% right now. You can see, I am looking at the globes right here.
You can kind of smooth them out a little bit, but I would show restraint when using this slider. Now, one of the things that we're going to talk about in an upcoming movie is using other image editors in conjunction with iPhoto. It's called round-tripping, where you get to send a photo to let's say Photoshop, work on it there, and then bring it back into iPhoto. The process actually works really well. This is an instance where I think round-tripping would be a good idea. If you really need to do some sharpening or some noise reduction, Photoshop handles that better than iPhoto, especially for shots that are going to be very important to you, like portfolio shots.
But for everyday use, as long as you don't go too far with these sliders, these will work. They're just not the best sliders in iPhoto.
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