tailieunhanh - Flash CS4 Professional in 24 Hours- P4

Flash CS4 Professional in 24 Hours- P4: 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. | Using Bitmaps Also Known as Raster Graphics 81 Figure shows the results of using several different compression levels on the same image. Notice JPEG 80 and JPEG 100 are almost identical in quality but JPEG 80 has a much smaller file size. You get the ultimate quality by using the compression option Lossless GIF PNG . It is selected by default when you import .png and .gif files but you can select it any other time you want to use it. When this option is FIGURE The results of different compression settings on the same image shows how quality degrades and file size shrinks. selected Flash leaves the image in its original state. This option always provides the best quality but not without a price. File size is highest when this option is selected. This is a suitable alternative if you re making a movie that doesn t need to download from the web for example if you re making a presentation that you are delivering on your hard drive or CDROM. Otherwise you should use this option only on images where you want to retain the best quality possible. If your imported image is a .gif that already has a small file size selecting Lossless is perfectly suitable. Because even 100 JPEG compression causes some image degradation the Lossless option is suitable for images that are particularly important. Finally the only way Flash supports 32-bit graphics that is raster images with varying degrees of transparency is through .png items that you set to Lossless. The fact that PNG is the only format that supports transparency is another perfectly legitimate reason to use PNG. 82 HOUR 3 Importing Graphics into Flash Smoothing Regardless of which compression option you use for your imported bitmaps Allow Smoothing as shown earlier in Figure is another option in the Bitmap Properties dialog. If you plan to scale or rotate the raster graphic you want to click that check mark. Normally a bitmap with its explicit number of pixels looks fine without smoothing. However smoothing .