MACROMEDIA FLASH 8-DEVELOPING FLASH LITE 2.X Develop Manual page 74

3.
Right-click (Windows) or Control-click (Macintosh) the bitmap's icon in the Library
window, and select Properties from the context menu to open the Bitmap Properties dialog
box.
4. In the Compression pop-up menu, select one of the following options:
Select the Photo (JPEG) option for images with complex color or tonal variations,
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such as photographs or images with gradient fills. This option produces a JPEG
format file. Select the Use Imported JPEG Data check box to use the default
compression quality specified for the imported image. To specify a new quality
compression setting, deselect Use Imported JPEG Data and enter a value between 1
and 100 in the Quality text box. A higher setting produces a higher image quality, but
also a larger file size, so adjust the value accordingly.
Select the Lossless (PNG/GIF) option for images with simple shapes and a few colors.
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This option compresses the image with lossless compression, in which no data is
discarded from the image.
5. Click Test to determine the results of the file compression.
Compare the original file size to the compressed file size to decide whether the selected
compression setting is acceptable.
You can also globally adjust the compression settings for bitmap images.
74 Optimizing Content for Performance and Memory