Graphics Programs Reference
In-Depth Information
20. Attach ShuffleCopy1's input 1 to the output of RotoPaint1.
The ShuffleCopy node is a really handy tool for this kind of stuff (see
Chapter
3
for more on this). ShuffleCopy's default setup lets you simply copy the alpha
channel from input 1 and copy the RGB channels from input 2.
21. Because this procedure creates an RGBA image that is not multiplied, insert a
Premult node after ShuffleCopy1.
Now that you have a premultiplied foreground, you can use a Merge node to con-
nect the foreground and background together.
22. While Premult1 is selected, press the M key to create a Merge node.
Figure 6.47. Your tree should look like this.
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