Hi, this is Gary, with MacMost Now.In today's episode, let's learn how to make 32-bit semi-transparent images to use as overlays in iMovies. So, a 32-bit image is an image that has four layers. The first three are red, green and blue, and the fourth one is transparency. A low value for transparency means you can see through that pixel and a high value means its opaque, you can't see through it at all. So you can create images that have a transparent background and only have graphics in certain parts of the image by creating a semi-transparent, 32-bit image. Now, usually you would use a perm like PhotoShop to create one, but not everyone has PhotoShop or PhotoShop elements. Let's look at a tool called Seashore, which is a branch of the free opensource Gimp image editor, and use that to create a 32-bit semi-transparent image. Now, the first thing that Seashore asks you is the width and height of the image. Now, since we're going to use an iMovie, iMovie's picture and picture feature works best when the image is the same dimensions, either 16 by 9, or 4 by 3, as the video you're making. So, for instance, if it's 16 by 9 you want to create something that is also 16 by 9. So a 640 360 will work. Also another good value will be 1280 by 720. If it was 4 by 3, you would want to do maybe 640 480 as your width and height. We also want to check off transparent background, this will create the 32-bit image so that we have a semi-transparent result that we can use in iMovie. Notice the checkerboard background that's kind of universal for graphics program to show you that there's a semi-transparent background here that will show through to the image below it. So for this example let's just create a simple circle that we can use to circle an item in the movie. We'll use the circular selection here, and we'll just grab a large circular area. And I want to fill up the entire image as much as I can because in iMovie we'll be able to shrink this down to any size but if we need a smaller one it would be more difficult to handle. So, now that we've created tat, I'm going to use some modifiers here and use control and option to subtract a little bit from this...So.. going to create something a little bit smaller than that, like so.. And now I've got this selected area like that, I'm going to fill it in with a color. There. And now I've got my circle. So, now it's transparent out here and in the middle of the circle, and all we have is a black band around here. The next step is we want to export. We want to export it in a format that supports 32-bit images and will work in iMovie. So, png would be that format. And we will save it as circle.png. So now here I am in iMovie. And the idea is I want to take this graphic here in my desktop and use that to circle something in the video at a certain point. The first thing I want to do is I want to make sure in my iMovie preferences that I have "Show Advanced Tools" turned on, otherwise I can't use Picture in Picture. Then I will drag and drop this to the point in the video where I want to circle something. And one of the options I have is Picture in Picture. And now you can see it appear here above the video and this is the portion of the video and the timeline that it appears. And I can see it here in the preview area, I can see my circle appear. And you can see here how the transparent area shows through. And I can grab the anchors in the corners to stretch them and it'll stay in the same ratio, but I can make it a little bigger or a little smaller, so perhaps, for something like a circle like this I can actually reuse at different sizes. And also I select the video here, I can press "I" to bring up the "Inspector", and add something like a dissolve in and a dissolve out for that image. So now, it will dissolve in nicely, circle something and dissolve out at the end. So I hope you find this technique useful, til next time, this is Gary Rosenzweig with MacMost Now.