Graphics Programs Reference
In-Depth Information
Layering
in
Blender
with
the
alpha
channel
To perform layering in Blender Compositing, the alpha channel can be used either
with the Mix node or Alpha Over node.
Layering with the Mix node
The following screenshot depicts the process of layering using a Mix node. A back-
ground image is connected to the upper
Image
socket and a foreground image to
the lower
Image
socket of the Mix node. Now the result shows only the aliased RGB
channel of the foreground. If the foreground image has an alpha channel associated,
then
Include Alpha Toggle
should be used in the
Mix
node, as shown in following
screenshot:
If the foreground image doesn't have the alpha channel, then a separate alpha image
can be fed to the
Fac
socket of the Mix node to obtain the same result. Alternatively,
if the combined channel is accessible, then a
Separate RGBA
converter node can be
used to extract the alpha channel from the combined pass information and can be fed
to the
Fac
input of the Mix node, as shown in the following screenshot:
