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10 Multiple Images > Creating Looping Video Backgrounds - Pg. 196

196 Secrets of ProShow Experts: The Official Guide to Creating Your Best Slide Shows with ProShow 5 Note This technique is described here for ProShow Gold using separate slides. ProShow Producer provides keyframing, which is a better fit for this kind of motion and can be done all in one slide. Enhancements like colorization in ProShow Producer are easily performed arbitrarily at any keyframe, so multiple changes to effects can happen simultaneously with ProShow Producer without having to add more slides. Creating Looping Video Backgrounds A common trick used by videographers to add polish to slides is using a video back- ground with nice-looking visuals that are designed not to grab your attention away from whatever is in the foreground. You can purchase these kinds of background videos from a variety of vendors on the Internet; some sites even have them for free. Professionals creating such backgrounds use various video-editing tools. The tech- niques to create looping backgrounds for sale are mostly beyond the scope of this book. However, a couple of simple tricks can get you on your way to creating loop- ing backgrounds that can add a little flair. Looping backgrounds should be abstract and usually should have no high-contrast edges. Instead, stick to things that are blurry or have only smooth fading edges. You can create shapes and patterns in an image-editing program to use in a loop- ing video. Gradient tools are a great way to get nice smooth fades in an image. Also, you can look around on the Internet for royalty-free images that have an abstract shape or pattern. Remember, you want things that don't really look like anything recognizable. The idea for a looping video is that the video you create must look the same at the last frame of the video as it does in the first frame. Doing this takes planning and attention to detail. If you don't get the starting and ending correct, your video appears to jump when it loops. At Photodex, we call this a pop. To perfectly avoid jumping, you also should pay special attention to the exact duration of the show. Each video format you can output to will have an exact frame rate, and if the end of your show does not line up exactly with an even frame time, there will be a slight pop when the video loops. For example, if you are using 720p at 24 frames per second, each frame of video will occur every 0.0417 seconds. Of course, this isn't quite correct because the actual value of 1/24 of a second is slightly less than 0.0417 seconds because the actual value is something like 0.4166666