Touring the Interface with a Basic Composite - Nuke 101: Professional Compositing and Visual Effects - page 45

A cross appears on Premult1, indicating that it is disabled. If you look at the im-
age, you can see you are back to the wrong composite. This shows that indeed it
is the Premult1 node that fixed things. Let's enable it again.
Note
Disabling a node means that the flow of the pipe runs through the
node without processing it. You can disable any node, and it's a very
handy way of measuring what you did.
4. With Premult1 selected, press D on the keyboard again.
What you now see is a classic Nuke tree: two streams flow into one. The fore-
ground and background connect through the Merge node. Incidentally, to com-
bine more images, you simply create another Merge node.
Beforeyougofurther,andthere'smuchfurthertogo,youshouldsaveyourNuke
script. What's a script? You're about to find out.
Saving Nuke scripts
Nuke saves its project files, or scripts , as ASCII files. An ASCII file is a text file that you
can open in a text editor. ASCII files stand in contrast to binary files, which don't make
anysensewhenopenedinatexteditorandareonlyreadablebyspecific applications. The
ASCII file format of the Nuke script is great, and you explore this feature in Chapter 12 .
Nuke scripts have the .nk file extension.