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Set compression of Flash Lite bitmaps for mobile devices

When using bitmaps, you can set image-compression options (on a per-image basis or globally for all bitmap images) that reduce SWF file size.

Set compression options for an individual bitmap file

  1. Start Flash and create a document.
  2. Select a bitmap in the Library window.
  3. Right-click (Windows) or Control-click (Macintosh) the bitmap 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, such as photographs or images with gradient fills. This option produces a JPEG 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 an image of higher image, but also a larger file, so adjust the value accordingly.

    • Select the Lossless (PNG/GIF) option for images with simple shapes and a few colors. This option compresses the image using lossless compression, which discards no data.

  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.

Set compression for all bitmap images

  1. Select File > Publish Settings, and then click the Flash tab to display compression options.
  2. Adjust the JPEG quality slider, or enter a value. A higher JPEG quality value produces an image of higher image quality but a larger SWF file. A lower image quality produces a smaller SWF file. Try different settings to determine the best trade‑off between size and quality.