No Low, Gamma and Gain independant channel controls?

[Dean Manion]

You can use curves.

[Arthur Puig]

Actually no, curves had the same effect, when I modify a red channel, for example, if you look at the scopes you’ll see the green and blue change accordingly as well, just like using the trackballs

[Giles Livesey]

Hello Arthur,

Yes, for some situations It’s nice to have completely independent control over R,G,B without any cross-talk between channels when you make a correction to Blacks, Midtones or Highlights of one of those channels.

Luckily, there is a way to achieve this on Resolve.

Firstly, if you right hand click on your top left Viewer>Waveform Options and select Parade (RGB Scope) when you make a change to say ‘midtones of the red channel’ you will notice changes in green and blue also.

If you go to the Config Tab (GUI Bottom Right) > Settings > tick ‘Luminance Defaults To Zero’ the calculation method Resolve uses changes to have separate R,G,B rather than Y,R,G,B it uses as default (i believe!) Note: this is saved with your project as a setting, just like resolution would be.

Secondly, when you go back and make a correction again in the red channel mid-tones, you’ll see that your Parade Scope shows no movement in Green and Blue. Hooray! This also works for RGB Curves also. (It used to be that this behavior was only added to new nodes but now it is activated instantly when you apply the change to your project settings).

I have noticed a caveat though. When using the beautiful new Resolve Control Panels, the Black, Mid-tone and White controls work fine and RGB is ganged for Blacks, Mid-tones and Whites so you can control the image luminance normally.

On my Mac using GUI only, the luminance controls (Lum Gain, Lum Gamma, Lum Lift) are currently not active in that mode. I will report this to BMD to see if it is expected operation. As a workaround any luminance changes would require a linked movement of R,G,B controls (for blacks, midtowns and whites) when using the Mac GUI. Printer light density changes do work though.

One more thing to remember, if you started your grade using one method and switch to the ‘Zero’ method; when comparing them using the still store your grade may have changed a little, so stick with one method only within a shot!

If anyone has a Tangent Curve then it would be great to hear if the master Luminance controls are operational like the big panel when in the ‘Luminance Mixer Defaults to Zero Mode’

Seems that if you are spending most of your working day grading with clients or without, the Resolve Control Panels offer much more speed and functionality at your fingertips for this type of tweaking. For example, you have the RGB Master Luma controls plus you have the Pre-Luma controls on your left of the trackballs. You can also have the RGB independent controls for Blacks, Mid-tones and Whites on the main displays. You can easily use a little of everything rapidly in your grading and still hit the deadline.

Hope that helps a bit!

Giles

http://www.digitalcolorist.com

[Giles Livesey]

Good News…

I received a very quick response from Blackmagic Design’s Resolve Team about ‘Luminance Mixer Defaults To Zero’ mode and they were very helpful.

You can drag the RGB bar/sliders whilst holding down the middle scroll wheel of your mouse. This gangs together RGB for the function you have selected: Blacks, Mid-Tones or Highlights. This means full control over Luminance and separate control over R,G,B when in ‘zero’ mode even from the Mac GUI!

Giles

http://www.digitalcolorist.com

[Ola Haldor voll]

Nice feedback. Will be tested in the next few hours.

[Rohit Gupta]

Just to add to the excellent explanation by Giles:

You can also use the “Lum Mix” (also referred to Make Lum sometimes) control in the Primary Widget to set the node to a 3-ch mode instead of 4-ch mode if you didn’t want to set the entire project to work in 3-ch mode.

Regards,
Rohit

[Arthur Puig]

Thanks so much for taking the time to ask Blackmagic about this.
I will test it tonight

Thanks again!