Color Correction - Nuke 101: Professional Compositing and Visual Effects - page 168

ables you to manipulate it. There are five curves. The first controls all the chan-
nels, and the next four control the R, G, B, and alpha separately. You can have
morethanonecurvedisplayinthegraphwindowontherightbyShift-clickingor
Ctrl/Cmd-clicking them in the list.
2. Click the Master curve in the list at left.
In the graph ( Figure 4.18 ), you can now see a curve (a linear one at the moment).
It has two points that define it, one at the bottom left and one at the top right.
Moving them will change the color. For example, moving the top one will create
a Multiply operation.
TheColorLookup'sstrengthliesinmakingcurvesthatyoucan'tcreateusingreg-
ular math functions. For that you need to create more points.
3. To create more points on the curve, Ctrl/Cmd-Alt/Option-click the curve in the
graph window. It doesn't matter where on the curve you click.
You've just created another point. You can move it around and play with its
handles. If you look at the I/O graph on the Viewer, you can see that it mimics
whatyoudidintheColorLookupnode.Theyareexactlythesame( FIGURE 4.19 ) .
Figure 4.19. Changing the curve is just like working with an I/O graph.