TAILIEUCHUNG - Flash CS4 Professional in 24 Hours- P15

Flash CS4 Professional in 24 Hours- P15: The creation of this book could not have happened without the skill and patience of many, many people at Sams Publishing. Most of all, I want to thank Mark Taber for offering me this opportunity and Philip Kerman for writing such a great book. I also greatly appreciate the efforts of Songlin Qiu for keeping me on track and organized, not an easy task. | File Size Considerations 411 graphics don t matter but sounds and bitmaps are more significant. Anything you can do to reduce their size results in major savings in the file size of a movie. Sounds Flash provides several ways to compress audio and bitmaps. You saw that these compression settings are specified individually via the Library item properties for each imported bitmap or sound in Hour 3 Importing Graphics into Flash and Hour 13 Including Sound in Animations. You also see in Hour 24 Publishing a Creation how you can set compression settings for all imported bitmaps and sounds at once via the Publish Settings dialog box. Although you know where to set the compression settings you might not fully understand how this affects your movies. Different types of compression exist. For audio you should always use MP3 or Voice. Although Flash supports Adaptive Differential Pulse Code Modulation or ADPCM you should only use this if you are publishing your movie as Flash 3 or lower that is you want the audio in your movie to work for people who have only the Flash 3 player. If you happen to be delivering your movie to run only on your hard drive you can specify no compression and use Raw. Barring those two situations MP3 is the best choice. A simple relationship exists between quality and file size. You learned how to set the compression settings individually for just one sound in Hour 1 Basics. Basically you try one setting and listen to how it sounds. As you try greater levels of compression you both hear the difference and see the file size change. It s just a matter of balancing these two priorities good quality and small file size. There are a couple additional ways to optimize sounds. The easiest one to remember is that stereo sounds are twice as big as mono sounds. Therefore you should enable Flash to always convert stereo to mono unless you truly need stereo. Keep in mind you can still use stereo panning effects on sounds that are mono. When a frame with sound

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