Rendering and Compositing - Blender Master Class: A Hands-on Guide to Modeling, Sculpting, Materials, and Rendering - page 235

Figure 14-4: The two render passes for the Bat Creature

4. Apply some basic color grading to the image.

5. Add a vignette to the image.

These effects (as with all things in the com-
positor) need to be applied in a particular order.
Because each node is processed in the order it is
connected, changing the order in which you apply
nodes to your image can make a big difference. To
begin compositing, make sure that Use Nodes is
enabled and that you are editing the compositing
nodes (not a material or texture). The default com-
positing node tree should look like Figure 14-5.
The initial Render node will use the first ren-
der layer you created in the Layers panel, which
in my case was the body layer. I added a second
Render Layer node ( shift -A 4 Input 4 Render Layer)
to hold my strand render layer, selecting it from
the drop-down menu at the bottom of the Render
Layer node.

Figure 14-5: The default node tree for Blender's compositor
is pretty basic. Whatever you connect to the sockets of the
Composite node will become the final output of your render.