Technicolor 3-Strip in 21 nodes or less
The secret is in breaking up your RGB signal and then getting the band back together again.
Downloads?
I considered offering this as a downloadable power grade but felt it was a useful 5-minute exercise to make your own.
About Technicolor 3 Strip
Technicolor's three-strip film process, introduced in the 1930s, was a groundbreaking color motion picture technique. It used a special camera that captured three separate black-and-white film strips, each filtered to record one of the primary colors: red, green, and blue. These strips were then combined in post-production to create vibrant, full-color images. The process produced strikingly vivid and saturated colors, making it a popular choice for classic films like The Wizard of Oz and Gone with the Wind. Despite its complexity and cost, it set a high standard for color in cinema.
Setting up the Tree
The first 3 nodes are to start the process of separating out the individual channels. The only settings changed are in the RGB Mixer Page.
Settings for Node 1 Red
Now, a Gain Adjustment
Next, these RGB Mixer adjusted nodes feed into another node set where the only change was to lower the gain in the primaries to 50.50.50.50. Just make sure you label the nodes so you don’t get confused later
Primary Panel Settings for Nodes 4-6
Now the Math with Layer Mixers
The first set of layer mixers should be set to have their composite mode set to subtract
The top input from each one will take the main feed Nodes 1-3
The bottom input takes specific inputs from the Primary adjusted version.
Read the graph vertically as RGB. The top Layer mixer is R, and the bottom is B, Middle is G
The Red layer mixer should have a bottom input from the Green 50 Node 5
The Green & Blue Layer Mixers should have a bottom input from the Red 50 Node 4.
Following the stack of layer mixers are correctors that operate as nulls to bridge the gap to the next set of layer mixers whose composite mode is set to Add.
The Red & Green Layer Mixers should be added in the bottom input Blue 50 from Node 6
The Blue Layer mixer should have Green 50 Node 5 in the bottom input
After that, put all three channels back together with a layer mixer that is set to Add.
And there you have it!
Some Test Shots
These shots have the same pipeline going from camera space to DW/I to Rec.709 via OpenDRT
In between the color space transformations is the node tree as described above.
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