Thanks! I was trying to replicate the 3-strip Technicolor look, and so I intended for the blues and reds to look slightly less sharp than the greens (but just slightly). Also, in accordance with the modern technique, I wasn’t going to add the key layer (basically 50% of the green strip on black and white film), but it would’ve looked a quite bit blurrier without the key layer. So, I composited the key layer over the other three layers with a soft light blend (the green and blue layers both use the add blend) and reduced multiplication to 0.500.

As for the red layer, I gave it a hue of 0 and a saturation of 0.905; for the green layer, the hue was 0.333 and the saturation was 0.263; and the blue layer had a hue of 0.667 and a saturation of 0.482. All were in accordance with the values seen on page 6 of this paper, under the heading “A Spectrally Based Method for the Emulation of the Technicolor Process on Digital Images”.

Regarding the blurriness, I applied a Gaussian blur of 15 to the red layer, a Gaussian blur of 5 to the green layer, and a Gaussian blur of 10 to the blue layer, while leaving the key layer unblurred. If anyone has any better values for me to use for each layer, feel free to let me know.