Thẻ Properties phía dưới cho phép bạn chọn kích cỡ (Width, Height), màu nền (Background), số frame chạy trong 1 giây (Frame rate), mặc định là 12 frame/s. - Để chèn hình vào, chọn File Import. Bạn có thể tùy ý chỉnh sửa kích cỡ của file hình mới nhập bằng cách bấm vào hình vuông ở góc bức hình và rê chuột. | FROM AFTER EFFECTS TO FLASH POETRY IN MOTION GRAPHICS If you are going to be encoding an alpha channel video you must use the advanced encoding settings. 4. Click OK to close the Advanced Settings area of the Flash Video Encoding Settings dialog box. Click the Start Queue button to start the encoding process. When it finishes quit the Video Encoder. Adding and using alpha channel video in Flash Adding alpha video to Flash is no different from adding any other video to the application it is what you can do with it that moves it from regular to cool on the Flash technique scale. 1. Open a new Flash document pull an FLVPlayback component from the Components panel to the stage and link the FLV created in the previous exercise to the component. 2. Test the video and you will see the black background you saw in the Video Encoder preview is gone and the white background of the Flash stage is visible see Figure 4-14 . Figure 4-14. An alpha channels removes the background in a video. Now that you understand how to create encode and deploy the video you are probably wondering What else can I do with it The answer is Quite a bit. When you encode the video the alpha channel stays with the video and Flash reads it. This means that Flash really isn t seeing a video it is seeing a series of colored pixels enclosed within a shape. This is the key to playing with alpha video in Flash. One of the most common shapes used for a Flash animator s first Flash animation is usually a circle. Flash sees that circle as being no different from a video. It is a circular shape filled with colored pixels. In Flash 8 developers and designers were handed a rather serious set of effects and blend modes that can be applied to objects in movie clips. Knowing how Flash sees a video with an alpha channel and that effects and blends can be applied to movie clips it doesn t take a degree in rocket science to come to the realization that alpha video placed in a movie clip allows you to apply the Flash .
