Working With Higher Image Resolutions; To Change The Duration Of Still Footage - Adobe AFTER EFFECTS 7.0 Manual

Before you import a still image into After Effects, prepare it as completely as possible to reduce rendering time. It is
usually easier and faster to prepare a file in its original application. Consider doing the following:
•
Make sure that the file format is supported by the operating system you plan to use.
•
Set the pixel dimensions to the resolution you will use in After Effects. If you plan to scale the image over time, set
image dimensions that provide enough detail at the largest size the image has in the project. The maximum
resolution you can use in After Effects is 30,000 x 30,000 pixels.
•
Crop the parts of the image that you do not want to be visible in After Effects.
•
If you want to designate areas as transparent, create an alpha channel or use the transparency tools in applications
such as Photoshop or Illustrator.
•
If final output will be broadcast video, avoid using thin horizontal lines (such as 1-pixel lines) for images or text
because they may flicker as a result of interlacing. If you must use thin lines, add a slight blur so that the image or
text appears in both video fields instead of flickering between them. See "About interlaced and noninterlaced
video" on page 98.
•
Save the file using the correct naming convention. For example, if you plan to import the file into After Effects on
Windows, use a three-character file-name extension.

Working with higher image resolutions

After Effects supports a maximum image resolution of 30,000 x 30,000 pixels for importing and rendering files,
except for PICT (4,000 x 4,000 pixels), BMP (16,000 x 30,000 pixels), and PXR (30,000 x 16,000 pixels). Resolution
refers to the dimensions (width and height) of an image measured in pixels. When you work with higher resolutions,
you can use a wider variety of formats, such as IMAX frames (4096 x 3002 pixels), full-aperture/silent frames (4096
x 3112 pixels), and other large-format media.
The maximum resolution you can import or export can be reduced by the amount of physical RAM available to After
Effects.
See also
"Memory usage" on page 636

To change the duration of still footage

When you add a still image to a composition, its default duration is the duration of the composition. You can
manually trim the duration of a still image and change the default duration of still footage in the Import Preferences
dialog box.
Choose Edit > Preferences > Import (Windows) or After Effects > Preferences > Import (Mac OS).
1
2 Under Still Footage, do one of the following, and then click OK:
•
Select Length Of Composition to set the same duration for the still image as the composition into which it is
placed.
•
Type numbers in the text box for the duration you want to use.
See also
"About trimming" on page 162
ADOBE AFTER EFFECTS 7.0 74
User Guide