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In this movie, I'll show you a few methods for zooming continuously in and out from an image, just in case you want more control over your zoom ratios, so you're not limited to 25, 33, 50 and so forth. I am looking at this grayscale image at the 25% zoom ratio, and I'm seeing some moireing inside of his shirt. In other words, we're seeing some patterning that doesn't really exist. But I want to do so, as a say, with little more deliberate control. I'm going to move my cursor over the portion of the shirt that I want to zoom in on, then I'll press the Alt key or the Option key on the Mac, and I'll scroll up on my mouse so I'm moving the scroll wheel on my PC mouse upward as I have the Alt key down.
On the Mac, you would presumably just move your finger upward as you press the Option key. In either case, if you're working with a track pad, you could just press Alt or Option as you scroll upward as well. Notice that two things are happening. First of all, we're zooming in much smaller increments, which is really great, and we're zooming in on the cursor location which gives us a lot more control as well. So that's one way to work. If you want to zoom out then you press the Alt key or the Option key on the Mac and you scroll downward on your mouse. All right, I'm going to press Ctrl+0 or Command+0 on the Mac to zoom all the way up.
You can also zoom continuously using the Zoom tool. So if I press and hold the Z key to get that Zoom tool on the fly and I click and hold on his eye, notice that he starts zooming toward me, and after I zoom in and pass 600%, I start to see the Pixel Grid that is the line between the pixels. To zoom out, I would just keep the Z key and my mouse button down and I press and hold the Alt key or the Option key on the Mac. So as long as you're pressing Z and clicking and holding, you're going to zoom one direction or the other continuously.
Here's another option you can take advantage of. I'll zoom out again by pressing Ctrl+0 or Command+0 on the Mac and I'll press and hold the Z key. If I drag to the right, I'm going to zoom very, very quickly in. If I drag to the left, I'm going to zoom very quickly out. For some folks who've been using the software for a very long time that's pretty confusing because that's not the way it used to work. Let me show you how you can revert the behavior if you like. I'll go ahead and manually switch to the Zoom tool, either by clicking on it or tapping the Z key.
Notice that check box, Scrubby Zoom. If you turn it off, you get the old behavior, by which I mean, instead of dragging with the tool to suddenly zoom in or out, you drag to marquee the portion of the image that you want to zoom in on, and then as soon as you release, Photoshop zooms and centers that portion of the image on screen. So you can pick your poison and work any way you like, but in any event, you have a lot of options for continuously zooming in or out from the image here inside Photoshop.
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