Color Correction - Nuke 101: Professional Compositing and Visual Effects - page 159

is a value of 0.5 and so shows as a white pixel in the middle of the screen.
Theright-mostpixelisavalueof1andsodrawsawhitepixelatthetopof
the screen. All these white pixels together form a diagonal line ( FIGURE
4.9 ) .Changingthecoloroftherampwillchangetheline.Thishappenson
each of the three color channels individually.
Figure 4.9. The I/O graph at its default state.
Let's start using this I/O Graph tree. You will insert a Color node in between
Ramp1 and Expression1 and look at the resulting I/O graph.
5. Insert an Add node from the Color > Math toolbox after Ramp1 as shown in
FIGURE 4.10 .
Figure 4.10. Add2 has been inserted after Ramp1 and will change your I/O
graph.