Easy-to-follow video tutorials help you learn software, creative, and business skills.Become a member
It's an important thing to have your graphics and photos be focused on the subject what you are discussing and having the ability to remove unwanted backgrounds is a really powerful feature of the iWork suite. Let me talk to you about the Instant Alpha feature that's built in the Keynote. Let me go up here into my Media browser and I'm going to pull over this logo called Ducati logo and let go and you can see this logo has a white background around it and of course we don't want that for presentation. We would like to be able to get rid of that white if we could. I'll go here to the Alpha tool, click on that and I'm going to hover over my selected object and I'm going to click once and let's see what happens. You will see that background that was white turned blue. That's letting me know that this is the area that I'm selecting now to remove.
In other words, the point that I clicked on is my sample point, which was white, and it's looking for every bit for white that's contiguous with that original point and it's going to say, "I'll get rid of this for you." Now notice the edges right around the logo, you can see a little bit of white still showing. I'm going to drag this tool out a little bit. You can see this radius increasing and as I do so more and more, I'm telling this sampler to be a little bit more generous or go out a little bit farther and pull out some more white and you can see that its making that edge even smoother. When I let go, when I click off, you can see we have a really credible alpha channel built into this particular graphic. An alpha channel is this area that's transparent.
In other words, now when I hold it over this you can see that we can see right through it. That's a pretty powerful feature, something that's normally very complex that we were able to do very quickly. Let me go on to Slide 2 and show you how this works with the photograph. I'll go up to my Media Browser, click the photo here, drag this in and let go and I'll close the Media Browser and we'll have a look here. Now this is a much more complex image with much more complicated background instead of that nice clean graphic. Let's see how well the Alpha tool can work here.
I'll go up and click on that and I'm going to start appear in this brown area and I'm going to click and hold. You can notice already that because there are so many different colors now in the background, this whole selection process looks a bit different. What I'm looking at is I want to make sure that this blue area that's growing as I'm changing this radius doesn't encroach upon the helmet or the motorcycle or the parts of the image that I care about and the nice thing about this tool is that you don't have to do everything at once. So I'm not going to let go right now and I can take it in stages. I can be patient. It's important to know that you can take your time with this tool.
It's doing a lot of complicated things. If you are patient with it and you just kind of keep your eye on what parts are being selected, you can take it step by step and really get a very credible mask taken out of it. Now, let me exaggerate this just for a second on this stage. I'll grab it too much. That's way too much, but you can see here that brown has encroached upon the image itself and if I let go and click off you can see we have kind of destroyed the image a bit. So you can go too far, but you can always go back. I'm going to press Command+Z, take it back to where we were, I'll press on the Alpha tool again and I'll just keep pulling out little bits, taking my time.
Normally something like this in Photoshop in a very complicated photo like this will take a long time and if you really want to get a perfect mask, you might want to do that. But what's nice about this is it's something you can do really quickly to see if this image is actually going to work in your presentation. Let's do it few more. Now remember here in this original photograph our tire was truncated little bit on the bottom so that flat part came from the original and not from the any of the Instant Alpha that we are doing here. Pull that back a little bit and let go.
So you can see from that very complicated photograph-- and there are few bits here I can clean up but you get the point. We got a very credible mask and because of this bottom part it was a little too close to the original color and it was flat anyway, I'm just going to take this image, I can just hide it underneath the edge there and that's works just fine. I can go up here now to the Format bar, click on the Shadow and you can see that Keynote builds the shadow around the new image that's been created from that alpha channel creation. So it's a very impressive feature. One more thing I would like to show you on Slide 3.
Let's say we were given this logo graphic with this background. Of course, we don't want the background. I'll click on the object, go up to the Alpha tool, again click and hold and you can see it pulled the dock quickly because it's all the same color. A new feature for Keynote '09 is I'm going to hold down the Option key right now. I'm lifting the Option key up off and on here. It will take parts of that Alpha Channel that are non-contiguous, so you don't have to do those multiple iterations of pulling out things from the middle. You can just hold down the Option key and the Alpha Channel tool will look for all the colors, no matter if they are connected or not.
Let go. I have to got to say text is pretty hard to pull a mask and this did a very credible job, very quickly, of at least letting us know if this particular kind of graphic will work for us. So these built-in image editing tools in Keynote can really save you a lot of time and help you focus more on your presentation rather than on fixing your images. So Instant Alpha is not only a fast way to do mockups, it actually works.
Get unlimited access to all courses for just $25/month.Become a member
82 Video lessons · 76590 Viewers
80 Video lessons · 130792 Viewers
52 Video lessons · 64726 Viewers
59 Video lessons · 50553 Viewers
Access exercise files from a button right under the course name.
Search within course videos and transcripts, and jump right to the results.
Remove icons showing you already watched videos if you want to start over.
Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.
Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.
Your file was successfully uploaded.