Color Correction - Nuke 101: Professional Compositing and Visual Effects - page 169

Now let's use ColorLookup on the car image.
4. Select Read1 and Shift-click the ColorLookup node in the Color toolbox to
branch another output.
5. Click ColorLookup2 and press the 1 key to view it in the Viewer.
6. Play around with ColorLookup2's curves. You can play with the separate RGB
curves as well.
I ended up with FIGURE 4.20 —pretty drastic. But that's the level of control you
have with ColorLookup. The Reset button at bottom left allows me to reset this
mess.
Figure 4.20. Extreme color correction courtesy of ColorLookup.