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Once you have selected “all channels,” a new node will appear in the
Schematic, which displays tabs that each correspond to an output connection.
In other words, all channels are imported into different import nodes which
creates a group with multiple output connections that corresponds to each
import node’s output. The following image displays a UI with two schematics.
The Schematic on the left displays the group node, the Schematic on the right
displays the import nodes with their output connections.
Unpremultiply in Import Mode
In Composite, it is typically not desirable to work with images that have their
alpha premultiplied with the colors. If you are working with such an image,
then you should manually add an Unpremultiply node from the Image Import
tab or create a post-import script that does.
The Unpremultiply button is off by default for most formats, unless there is
information in the file that indicates the presence of an alpha channel that
134 | Chapter 8 Importing Media