Color; About Color Depth - Adobe AFTER EFFECTS 7.0 Manual

Use composition nesting to save time working and rendering. With composition nesting, you can do the following:
Apply complex changes to an entire composition
nest the composition within the overall composition, and animate the nested composition so that all the still images
change in the same ways over the same time period.
Reuse anything you build
other compositions as many times as you want. This can save large amounts of storage space, especially for compli-
cated effects, such as 3D layers.
Update many composition copies in one step by editing the original animated composition.
Update in one step
Alter the default rendering order of a layer
rotation) before rendering effects, so the effect applies to the rotated footage.
Note: Parenting is another way to apply complex changes to an entire composition. For information, see "About parent
and child layers" on page 208.
See also
"Default rendering order" on page 593

Color

About color depth

Color depth is the number of bits per channel (bpc) used to represent the color of a pixel. Channels contain color
information: RGB images have channels for red, green, and blue. The more bits per channel, the more colors can be
represented.
In After Effects, you can work in 8-bpc, 16-bpc or 32-bpc color mode for each project; 16-bpc and 32-bpc color
modes are available only in After Effects Professional. Many effects support 16 and 32 bits per channel (see "Color
depth and effects" on page 351).
Even if your output is 8-bpc (Millions Of Colors), you can obtain better rendering quality by having the project (or
render) color depth set at 16-bpc or 32-bpc because of the added precision achieved by calculating color values at
higher bit depths.
For additional information, go to Adobe Studio on the Adobe website.
Adobe periodically provides updates to software and Help. To check for upates, click the Preferences button
Adobe Help Center, and then click Check For Updates. Follow the on-screen instructions.
32-bpc color mode (Pro only)
dynamic range footage (Pro only)" on page 62).
After Effects assumes that all HDR footage represents color linearly—in linear light. When you import HDR images,
After Effects converts floating-point 32-bit values from linear light to the project's working color space (see "To
choose a working color space" on page 65).
If you haven't chosen a working color space for your project, After Effects converts HDR footage from linear light
using a gamma value of 2.2; this value represents the gamma for a typical monitor. Gamma is the exponent used in
converting RGB levels. When you render to a 32-bpc output format, After Effects removes the gamma applied on
import, converting 32-bit values back to linear light.
You can create a composition containing multiple still images,
You can build an animation in its own composition and then drag that composition into
You can specify that After Effects render a transformation (such as
Use 32-bpc mode to work with HDR (high dynamic range) images (see "High
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