RGB Mixer Looks

This post looks at changing the values in the RGB Mixer in Resolve based on Alexis Van Hurkman’s Color Correction Handbook. There’s a concept of changing the colors input into each of the Red, Green, and Blue channels that can inspire some interesting looks.

These looks are totally stylized. While you can still qualify the skin tones and build the look around the skin tones, I don’t think these looks will ever look grounded. After going through some sample footage, I thought the most interesting look came from a sunny, wide open field. Below is our base image. Technical Specs:

Camera: Sony A7S II
Color space: S-gamut3.cine and S-log3
Base Grade: Color space transform to Rec.709 in Davinci Resolve

The default RGB Mixer are as follows in the below image. Reading the Color Correction Handbook, along with various YouTube tutorials, one can get some interesting (albeit super sylized) images from changing the type of input in each channel. Note that the “Preserve Luminance” option is on. To get a slightly more balanced effect out using these channels, this setting should be turned OFF.

After experimenting with some of the settings, I came to only modifying the Green Channel by setting the green input to 0 and the blue input to 1. It was really just trial and error to figure out what look I could potentially get away with in a project that needs a surreal look without there being any skill or taste applied to the look. Note that preserve luminance is OFF.

This resulted in the grass turning reddish/pink! Super interesting, and makes me think back to a couple of films shot in South Africa where the leaves were pink. I’ve always wondered how to apply this without having to do an HSL qualifier, and it looks like this is one potential way to achieve that.

This is a topic for another day, but I’ve also been experimenting with cross processing and mixing up S-curves and other oddly shaped curves in the RGB curves section. I deactivated the RGB mixer and came upon this super warm look:

This is the curve combination I used:

I had a thought to myself to try and blend the RGB Mixer and the cross processing and got a further enhanced image. It’s definitely a super stylized look that’s not that practical, but definitely an interesting exercise in combining looks to get something surreal looking.

My final node tree:

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