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Masks allow you to crop and resize your images within the Keynote application itself, giving you a fast and easy way to get your images to fit just right. Let's look at a mask right now. This particular slide here I'm going to click on, you see this control come up for Edit mask. That's letting us know that this particular photograph has a mask associated with it. We double click on the image and you can see grayed out here. This is the actual size of this particular image and this area, the one that we were seeing was the masked part of that. In fact, all three images on this side have been masked off. But let's recreate this leftmost image in the next slide. We'll go down to Slide 2, which is the same slide but without that image. Go up to the Media Browser and we'll pull over 848 front and let go and you can see indeed it is rather large.
It will be close to my Media browser out here. And let me open up my Inspector and click on the Metrics inspector. So you can see it's a fairly large photograph that's here, it is 1617 wide and with this photograph selected, I'm going to go up here in the toolbar and click on the Masks button and that gives me a default mask size. So notice these boundary handles here. These represent the boundaries of the mask itself. The gray parts, you can see the edge. This represents the original photograph and I can change the mask boundary the way I want to and if I click off of that, you can see now it's created it's own independent image. Now if I want to go back to my original and change that, I can, up here in the Metrics inspector I can click on original size and it comes right back. So let me mask it again.
Now it's helpful to see that this Mask Editing mode has about three states, if you will. This first state here with the hand showing and the mask control window up means I can grab and I can move the image around within the mask itself with the mask staying static. If I let go, I can also, with that same Hand tool, grab the handle of the photograph itself. Here you can see I can scale it that way. I can also scale it in this mode by clicking on this slider within the mask control and scaling the image that way.
So now, you might be asking where are the controls for the mask edge. Well, if I click on that edge once, it will bring that part back up and I can reedit the mask edges again. In fact what I'm going to do now is line it up with the existing photographs at the top there, grab the bottom there. And I can also move the entire mask and keep the photograph still. If I grab that edge right here, click and hold. Now I'm just dragging sideways.
Now notice that I'm only moving the mask. The photograph is not moving with me. So it's good to be conscious of what part of this editing state you are in. For instance, now if I rollover and that hand appears, if I click and hold, now I can just move the photograph but the mask will stay in place. I align it up pretty much to where original one was. Out there and then click off. And then the third state is this final state, which is, if I grab the handle of this object now, it's going to let me scale the fully masked object.
So the entire object now is treated almost like a new photograph and the entire masked photograph will scale if I grab that particular corner and I can give this object a frame like the other ones. Go to Picture frame, drop it down to little 40s and I can scale this just like I can in the other object. Now let's go to slide 3. Let me close up my Inspector window here. Let's say you are given the task of making all of these photographs have round corners.
The design I came to is that I need these with round corners. What can you do? Well you can also build masks using existing shapes. And we're going to do that on this particular slide. I'm going to go up here to Shapes and I'm going to pull down a curved rectangle and I'm going to drag it over this photo to get in the center. Then I'm going to grab a corner and holding the Option key so it stays centered. I'm going to grab it up and you can see there it locks in to the size of the existing photograph. Now we wanted a radius change, so I'll pull on this Radius tool and increase the radius of that curve to give it a little bit more curviness and because I want that same shape to mask across the other photographs, I'm going to hold down the Option key, click and hold and that allows me to duplicate this slide and while still holding the Option key, I'm going to click and hold again.
You can see I can move that shape over to that one as well for not the mask yet but that's what we are going to do next. If I marquee select both of them, so now I have both the mask and the photograph selected. I'll go up here to the Format menu and pull down the mask with selected shape. And when I choose that, you can see what happens. It created a mask based on that shape. If I click off, you will see very clearly it created a curved shape of the mask around that photograph, perfect. I'll do the same thing. Now let me select both of these and go up to Format.
Oops, it won't work, why wouldn't it work? We can only do one at a time. Keynote doesn't know which shape is going to mask which object in this particular case. So you can do that one at a time. So I'll Marquee select both of those and now you see that command comes up, Mask with Selected Shape. Format > Mask with selected shape. That looks great. Now suddenly you realize, oops! I forgot to do this bottom 3. How do I get that shape back? Now what you can do is click on one of those and up here in the Format menu, choose Unmask.
What that does is that will bring it back to the original photograph and the shape for which you made that mask. So let me click off of that, click on that shape again, hold down the Option key and drag so now I'm duplicating it again and I won't make that same mistake. I'll copy it there, click and hold Option key, drag it over here and again Option+ Drag over there. Now I'll marquee select this object again and I can do it fast with masking Shift+Command+M, select that, Shift+ Command+M, Shift+Command+M. Now notice that it's showing me the original size of the photograph. That's okay. It's all being masked up but it is helpful. It gives you little reminder that, hey, there is a pretty big photograph behind there in case you care and then Command+Shift here, same thing, click off and there I have my masks for my shapes.
So the upshot is that the flexibility of the mask function that's built into Keynote allows you to focus your energies on building your presentation story rather than spending your time in an external editor, cropping and masking your images.
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