ADOBE AFTER EFFECTS 7.0
User Guide
621
Note: IfyouaregoingtousetheresultingmovieinanotherAfterEffectscomposition,typeasmallvalue(lessthan5)in
the Key Frame Every box or deselect the Key Frame Every option. The presence of keyframes greatly increases the
memory required to edit and render a movie.
7 Click OK.
8 If your compressor choice supports different image color depths, choose the appropriate color depth in the Output
Module Settings dialog box:
• Choose Millions of Colors+ if you want 24-bit color quality and you want your composition 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 SelectotheroptionsintheOutputModuleSettingsdialogbox,asdescribedin“Tochangeoutputmodulesettings”
on page 607. Then click OK.
QuickTime compression options
Choices you make in the Compression Settings dialog box require trade-offs between file size and movie quality. The
higher the visual quality of your movie, the larger the file size.
Quality The Quality control specifies the spatial compression of the movie, which compresses the data in each frame
of a composition. Higher quality produces better image quality but results in a bigger movie file. Note that this
quality is unrelated to each layer’s quality setting in After Effects.
Key Frame Every In QuickTime terminology, the term key frames is different from the change-over-time keyframes
placed in the After Effects Timeline panel. In QuickTime, key frames are frames that occur at regular intervals in the
movie. During compression they are stored as complete frames. Each intermediate frame that separates them is
comparedtothepreviousframe,andonlychangeddataisstored.Thisgreatlyreducesmoviesize.Shorterintervals
between key frames enable faster seeking and reverse playback, but can significantly increase the size of the file.
To specify Video for Windows compression options
1 In the Render Queue panel, 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.
Chooseacompressorbasedonthetypeoforiginalimagesyouhaveandthepurposeoftherenderedmovie(available
compressors depend on the Video for Windows codecs installed on your computer).
You can render with 10-bpc YUV compression to create 10-bpc AVI files for use with HD footage in Adobe Premiere
Pro: choose 10-bit YUV (4:2:2 YUV) from the Compressor menu.
5 Select a Compression Quality level.
6 If you selected either Cinepak or Microsoft Video 1 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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