Adobe After Effects CS3 Manuel d'utilisateur télécharger pdf (Page 36)

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AFTER EFFECTS CS3

User Guide

When rendering your final movie, choose a file type and encoder appropriate for the final media. The corresponding

decodermustbeavailableonthesystemusedbyyourintendedaudience;otherwisetheywillnotbeabletoplaythe

movie. Common codecs (encoders/decoders) include FLV, Sorenson, MPEG-4 video, and codecs installed with

media players such as Flash® Player, RealPlayer, Windows Media Player, and QuickTime Player.

AharonRabinowitzhasanarticleontheCreativeCOWwebsiteaboutplanningyourprojectwiththefinaldelivery

specifications in mind: www.adobe.com/go/learn_ae_aharonplanning.

Mobile devices

Manyoftheconsiderationsforcreatingmoviesforplaybackonmobiledevices,suchasmobilephonesandtheApple

iPod, are similar to those for creating movies for playback on personal computers—but the limitations are even more

extreme. Because the amount of storage (disk space) and processor power are less for mobile phones than for

personal computers, file size and data rate for movies need to be even more tightly controlled.

Use these tips when shooting video for mobile devices:

• Tight shots are better. It’s hard to see a face on a tiny screen unless it’s shot in relative close-up.

• Light your subjects well, and keep them separated from the background; the colors and brightness values between

background and subject should not be too similar.

• Avoid excessive zooming and rolling, which hinder temporal compression schemes.

• Because stable (non-shaky) video is easier to compress, shoot video with a tripod to minimize the shaking of the

camera.

• Avoid using auto-focus and auto-exposure features. When these engage, they change the appearance of all of the

pixels in an image from one frame to the next, making compression using interframe encoding schemes less

efficient.

Use the following tips when working with After Effects:

• Use a lower frame rate (15-22 fps) for mobile devices.

• Use motion-stabilization tools and noise-reduction or blur effects before rendering to final output, to aid the

compressor in reducing file size.

• Match the color palette to the mobile devices that you are targeting. Mobile devices, in general, have a limited color

gamut. Previewing in Adobe Device Central can help determine if the colors used are optimal for an individual

device or range of devices.

• UseFormatOptionspresetsavailablethroughtheoutputmoduleintheRenderQueuepanel.Presetsareavailable

for 3GPP mobile devices, iPod video, and PlayStation Portable.

• Consider using cuts and other fast transitions instead of zooming in and out or using fades and dissolves. Fast cuts

also make compression easier.

Afteryou’verenderedyourmovie,youcanviewitexactlyasitwillappearonanyofalargevarietyofmobiledevices,

using Adobe Device Central.

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Adobe After Effects CS3 Manuel d'utilisateur Page 36

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