Color Correction - Nuke 101: Professional Compositing and Visual Effects - page 185

5. HoveryourmousepointerintheViewerandpresstheRkeytoviewtheredchan-
nel ( FIGURE 4.39 ).
Figure 4.39. Viewing the red channel.
Nowyouarelookingonlyatlevelsofgray.Ifyounowchangetheredsliders,you
will better match the color while still looking only at gray.
6. Display the Color Wheel and Color Sliders panel for the Gamma property by
clicking the Color Wheel button.
You will also want to change the Multiply and Offset values to achieve a perfect
result. This is because, even though you matched the black point and white point,
the distance of the car from the camera means the black point will be higher and
the white point lower. At the end of the day, it will only look right when it does,
math aside.
Let's display those extra color wheels.
7. Ctrl/Cmd-click the Color Wheel button for the Multiply and Offset properties.
Your screen should look like FIGURE 4.40 .
Figure 4.40. Opening three color wheels to easily control three properties.