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There will be times when you need a talking head video or you want to move the subject of the video from the studio to another location. These are the instances where an alpha channel video fits the bill. If you watch the weather on your local television station, you are seeing this in action. The weather reporter stands in front of a green wall and starts pointing to fronts and cloud formations. But the stuff being pointed at isn t actually on the wall. To create the scene, the weather reporter is pulled out of the green background location and superimposed on the radar image. The type of video where a green or blue background is removed, or keyed, is called alpha channel video. If you are a Photoshop CS5 or Fireworks CS5 user, you are quite familiar with the concept of an alpha channel or masking channel. The difference in a video-editing application is that the channel or mask is in motion. How do you know you have been handed a video containing an alpha channel Open it in the QuickTime player, and check the movie information. If the codec used to prepare the video is Animation and the number of colors is Millions+, the channel is there. The ability to use this type of video was introduced in Flash 8 Professional. To use this feature in Flash CS5, you need to select the On2 VP6 codec in the Adobe Media Encoder. This means that if your target Flash Player is Flash Player 7 or older, you can t use alpha video.

To see alpha channel video In action, let s try it with a short video. You will encode a small clip of a young adult who has just been informed by his friend that he is dead as the result of being hit by a bus. Then you will place the video over an image in Flash.

At first, all Web pages were static; users requested a resource, and the server returned it. Nothing moved, nothing flashed. Frankly, for a great number of Web sites, this was just fine Web pages were nothing more than electronic copies of text that was at one point bound and distributed. In the early days of the browser, the static nature of Web pages wasn t an issue; scientists were using the Internet to exchange research papers, and universities were posting class information online. Businesses hadn t yet figured out what to do with this new channel. In fact, at first, corporate home pages often displayed little more than contact information or some documentation. However, it didn t take long for Web users to want a more dynamic experience. The personal computer was a stalwart of business, and from dorm rooms to home offices more and more computers were starting to appear. With the advent of Windows 95 and the rich experience of thick applications such as Corel WordPerfect and Microsoft Excel, users expectations were rising.

shown in Figure 10-31. If you fail to select this check box, you will lose all transparency in the background.

6. Click OK to return to the render queue. 7. Click the Start Queue button. When the render process is finished, quit the Adobe Media

Like AOP, frameworks show dependency inversion, as previously described, whereby the code of the application does not depend on the library. A framework1 is a set of classes that offers a reusable structure for writing applications. Frameworks are used in numerous areas of application development, especially user interfaces. A J2EE application server can be considered a framework that manages the execution of applications based on web or Enterprise JavaBeans (EJB) components. Developing an application with a framework consists of writing code that is handled by the framework. This code is not run directly instead, the framework invokes it according to the context. In other words, the framework forms a set of services that extends the code that you write. The situation is similar with AOP. Services are provided by aspects that extend the business layer of the application. The difference is that frameworks provide a set of fixed services, whereas those provided by AOP are entirely programmable within the aspects. AOP therefore offers a much more general mechanism for dependency inversion than frameworks, which are limited to the application domain that they were initially conceived for.

panel, set the source parameter to your alpha video, and set the skin parameter to None. With the component selected, in the Properties panel, set its X and Y values to 0,0.

Figure 10-32.

In the autumn of 2006, Adobe quietly announced that full-screen Flash video was no longer a dream. Fullscreen video was released as a part of the Adobe Flash Player 9 beta. But even though it was well received, many thought the process was a bit too convoluted. Between its introduction and Flash CS5, fullscreen video became easier to add to you movies and deploy on the Web. Depending on how you want to approach the application of full-screen video, it can be either dead simple or require a bit of poking around with ActionScript and in the web page s HTML. Let s explore both methods.