Combining Shared Nodes and Group Grades Part 1 – Applying CSTs, Looks, and LUTs

You make a reference in this tutorial to color separation techniques introduced by Cullen Kelly. I’ve seen all Cullen’s posts, but, I seem to have missed his color separation technique in which he uses the RGB Mixer. Where is the tutorial in which he discusses the RGB Mixer?
TIA

Hey Charles –

Peder mispoke a bit. In this Insight – https://mixinglight.com/color-tutorial/the-10-minute-grade-shot-balancing/ right around 6:58 Cullen discribes disabling Red and Blue channels on a node level and then using the gain control to balance a shot. It’s worth noting you def. can achieve similar results with the RGB Mixer but Cullen didn’t actually show that .

Out of sheer curiousity, I decided to go play with the RGB mixer. It’s an interesting way, sometimes much easier to pick up the blue channel when the lows/mids seem squashed. It sure does work quite well to stretch out the vectors along the red cyan(actually the skintone axis. In some ways it’s a more complicated way, as opposed to using printer lights. I have my Elgato Streamdeck programmed to add Printer Lights. But, this RGB-mixer looks interesting for certain situations when color information in a channel is missing.

Wow. I thought for sure that’s where I got that technique. Now I’ll have to actually find the source… I’ll post it here when I find it.
Cullen is doing something similar in his Color Separation insight, but not exactly the same. Its great stuff anyways, so he deserves the shout out:)

I did an Insight on using the RGB Mixer too – pretty much the same technique to stretch the yellow/teal axis, I use it a lot! At around 4 minutes https://mixinglight.com/color-grading-tutorials/revisiting-the-rgb-mixer-in-davinci-resolve/

Revisiting the RGB Mixer (in DaVinci Resolve)

Question.
Is it possible to add a clip in more than one group?

Great question, Luca. Based on the way that groups work, clips can only belong to one at a time. If a clip belonged to multiple groups, how would you resolve the differences in the pre- and post-grade areas?

That’s why employing shared nodes in groups is great. It allows you to apply the same operation to multiple groups while maintaining a single place to make edits.

YES! That’s where I got the technique. Thanks for reminding me Jamie!
That was a great Insight. Love how you use the RGB mixer to fix some very problematic shots and create color separation.

Thanks Peder for your clear answer.