Compositing CGI with Bigger Node Trees - Nuke 101: Professional Compositing and Visual Effects - page 96

This list shows the channels available for viewing for the current stream loaded
into the Viewer. In this case, Read1 has lots of extra channel sets besides RGBA,
so they are available for viewing.
2. Switch to the Col channel set (short for Color ) by choosing it from the Viewer
drop-down menu.
Thispass,simplycalledtheColorpass,representstheunlittextureasit'swrapped
around the 3D object. It is essentially the color of the object before it's been lit
( FIGURE 3.4 ) .
Figure 3.4. The Col channel set represents the unlit texture.