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8 If your compressor choice supports different image color depths, choose the appro-
priate color depth in the Output Module Settings dialog box:
Choose Millions of Colors+ if you want 24-bit color quality and you want your compo-
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sition background to be transparent (to include an alpha channel). The composition's
background color is disregarded. Only Animation and None can support the Millions of
Colors+ color depth.
Choose Millions of Colors if you want 24-bit color quality but want to include your
•
composition background color (no alpha channel).
Note: Color depth settings of Thousands of Colors or lower may cause banding and
dithered images.
9 Choose other options in the Output Module Settings dialog box, as described in
"Changing output module settings" on page 284. Then click OK.
Setting Video for Windows compression options
When setting Video for Windows compression options, you can specify the compressor
and compression quality. Compressors available for Video for Windows include Microsoft
Video 1, Cinepak, Microsoft RLE, Microsoft DV, and Intel Video. Choose a compressor based
on the type of original images you have and the purpose of the rendered movie:
Cinepak Use when compressing 16-bit and 24-bit video for playback from CD or for
desktop presentations. For best results, use the Cinepak compressor on raw source data
that has not been previously compressed with a highly lossy compressor. Note that this is
a slow compression method. With Cinepak, decompression is much faster than
compression, and the data rate for playback can be defined by the user. However, you
cannot save an alpha channel using the Cinepak compressor.
Microsoft RLE Use for lossless compression limited to 256 colors.
Microsoft DV Use for digital video camcorders.
Intel Indeo/Microsoft Video Use when compressing video for playback from CD.
Full Frames (Uncompressed) Use for a depth setting of Millions of Colors+ when an
alpha channel is required.
To specify Video for Windows compression settings:
1 In the Render Queue window, click the underlined name of the output module.
2 Choose Video for Windows from the Format menu.
3 Click Format Options in the Video Output section.
4 In the Video Compression dialog box, choose a compressor from the first menu in the
Compressor section.
5 Select a Compression Quality level.
6 If you selected either Cinepak or Microsoft Video in step 4, click the Configure button to
set other options:
For Cinepak, choose whether the movie is compressed to color or to black and white.
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For Microsoft Video, choose a level for the temporal compression quality of the movie.
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Temporal compression compresses a movie by comparing successive frames and
keeping only changed data. High temporal quality maintains smoothness of motion.
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Rendering a Movie
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