Apple Shake 4 - Manual (Page 613)

Chapter 23 Color Correction 613
Example 1: Proper Color-Correction Concatenation
The following example illustrates the correct method of concatenating color-correction
nodes. First, a Brightness node (set to a value of 4) is applied to an image. Next, a
second Brightness node (set to a value of .25) is added to the tree. The two nodes
concatenate (.25 * 4 = 1) to multiply the image by 1, resulting in no change to the
image. This is the ideal result.
If you turn on enhanced Node View (with the pointer in the Node View, press Control-
E), you’ll see that the nodes concatenate—indicated by a green line linking the affected
nodes.
Example 2: Incorrect Color-Correction Concatenation
The next example illustrates the pitfalls of incorrectly combining color correction with
other nodes. It uses the same node setup as in the previous example, but with an
added Blur node, which breaks the concatenation. The result is that two separate
color- correction adjustments are made. Because 8-bit and 16-bit image processing
paths truncate values above 1 and below 0, the above values have unexpectedly
negative results.