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Oftentimes, when making an adjustment, you'll want to zoom the image. This is because if you're doing anything less than 100% magnification, it could be very difficult to see the problems, particularly when it comes to noise, or grain removal, or sharpening. With the photo selected, you can go ahead and start to zoom. Now, there are several ways of doing this. Using the slider at the bottom allows me to pull in very tight. At this case, I am extremely enlarged, so the image is going to look pixilated.
However, as I pull around in here, I can really start to see the texture in that flower for the fabric, and this helps me make decisions about how much I would sharpen the image. One of the things I'd like to point out is that it's very easy to zoom in to a specific area. If you mouse over that area, and press the 1 key, it will zoom to 100% magnification where your mouse cursor is. Remember, iPhoto may need to load in image details, so you'll see a momentary pause as it refreshes the screen.
To zoom back out, just press 0. If you'd like to see 200% magnification for an area, mouse over, and press the number 2 on your keyboard. That will take you to 200% magnification. While you're zoomed in, you can click and drag with the hand tool there to see parts of the image. If you do go to 200% magnification, you will notice that things look a little pixilated, and that's because you've blown the image up beyond the minimum quality. To zoom back out, just press 0.
One additional option is to use the trackpad, or the magic trackpad with your Mac. By pinching and zooming, much like you would on an iPad, you can go ahead and zoom in. Pinch outward to zoom in, pinch your fingers together to zoom out, and this makes it very easy to see details of your image. Again, where the mouse pointer is will help control which area it zooms in on. And as you see, this is a very responsive way to move in and out of areas of your image.
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