2011

Table Of Contents
This role is not permanent and can be changed at any time. You can even
create a composition from scratch and assign it a Footage role. When a
sequence is imported, either by clicking the Import button or by dragging the
sequence into a library folder, a composition is created with the Footage role.
The role of a composition does not change its behavior at all in the application,
and is only used as an indicator of the intended use of the object.
Footage Composition
When an OpenEXR image is being imported, a suffix corresponding to the
Channel group is added if the selected Channel group is not a predefined
group, such as Colors or Colors+Alpha.
The name would be FileName.Alpha, FileName.Velocity. This is useful when
you need to import the same file twice, first to import the image channels
and then to import the motion vectors.
NOTE The description of the footage corresponds to the description in the
Information tab in the Tool UIsee
The Information Tab on page 122.
Premultiplication
Premultiplication is the process whereby an images RGB channels are
multiplied by its alpha channel. Composite nodes expect unpremultiplied
images. Furthermore, if you plan to use color correction, the images must be
unpremultiplied. See the
Premultiplication on page 337 chapter for a full
discussion of premultiplication.
138 | Chapter 8 Importing Media