TAILIEUCHUNG - Thiết kế flash với flash cs5 part 54

Làm việc với các Alpha Channel mặt nạ Một trong những tính năng mát mẻ trong Flash là khả năng làm việc mặt nạ kênh alpha. Alpha mặt nạ thường được tạo ra trong các ứng dụng chỉnh sửa video, chẳng hạn như của Apple Final Cut Pro hay Adobe Premiere của. | Working with Alpha Channel Masks One of the cool features in Flash is its ability to work alpha channel masks. Alpha masks are typically created within video-editing applications such as Apple s Final Cut Pro or Adobe s Premiere. The process involves opening the image within the video-editing application and creating the transparency using a specific color referred to as blue or green screening using luminosity levels or actually creating a mask in an image-editing application such as Adobe Photoshop and then importing the mask. For example you could film yourself against a green screen and then mask those areas out. When you open the movie in Flash any other background you place behind the movie will replace the original green screen. They do this in the movies all the time. Work with Alpha Channel Masks Open your video-editing application and create a specific alpha channel mask. The mask represents the areas of the movie for which you want to maintain transparency. Use your video-editing Export command and then select the Flash FLV format. Click Options or select options for exporting a Flash FLV file. If Options is not available open the Adobe Media Encoder from the desktop add the FLV file to the queue select a FLV preset format and then open the Export Settings dialog box. Click the Edit menu and then click Export Settings. The Export Settings dialog box appears displaying tabs for Source and Output. 342 Chapter 13 Click the Source tab. Select the Export Video check box. Click the Video tab. Select the Encode Alpha Channel check box. 0 Click OK. Click Save to save the file. 0 Open Flash Professional. 1 Click the File menu point to Import and then click Import Video. 2 Use the steps outlined in Using the Video Import Wizard on page 326. 3 Move to the Timeline and create a new layer directly underneath the video layer and name it backdrop. 4 Place an image in the backdrop layer. 5 Click the Control menu point to Test Movie and then click Test. When you view the

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