Is false colour for e.g. on a Flanders Monitor translatable to F/Stops or Lux?

[yves d]

Trying to see if there is a way to analyze a reference image on a flanders monitor with false colour and then be able to estimate what f stop I need my lights at to replicate the image on set.

I can see that sentence taken a couple of ways so to elaborate, I would throw a reference*image that I'm trying to replicate*from my computer up on a flanders monitor. I would then put false colour on to see all the values. When on set I could try to replicate the lighting and I would know what values to place my lights at based on the false colour from the reference image.*

I'm wondering if there's a way to translate that false colour reading of shadows, highlights, middle into a value I can use on my light meter. The reason being is so that I don't have to wait for camera and monitor to be up before I start lighting, I can just use my light meter.

 

[Alex Lubensky]

It vastly depends on camera, reference image color space, monitor color space etc etc etc.

https://cinematography.com/index.php?/topic/75802-how-does-ire-correspond-to-exposure/

You can make a test with a desired camera before the shoot, creating conditions of 1-10 stops contrast, or higher if you need to. All in one image will show the desired IRE range for an f-stop. But you can't know each reference shot pipeline and aquision format.

The thing with IRE is it's relative to a color space, and gamma curve. Rec 709 is claimed to have 5.2 stops of DR, and higher DR is jammed into rec709 using gamma and color space mapping - each different for each camera/manufacturer, so the IRE value respectively.

In other words - it's highly questionable method, I'd rather stick with something like Ansel Adams exposure theory, which I'm actually using from the film days. But as I understand you just want to be more precise, which is imho still impossible without the camera.

 

[yves d]

It vastly depends on camera, reference image color space, monitor color space etc etc etc.

https://cinematography.com/index.php?/topic/75802-how-does-ire-correspond-to-exposure/

You can make a test with a desired camera before the shoot, creating conditions of 1-10 stops contrast, or higher if you need to. All in one image will show the desired IRE range for an f-stop. But you can't know each reference shot pipeline and aquision format.

The thing with IRE is it's relative to a color space, and gamma curve. Rec 709 is claimed to have 5.2 stops of DR, and higher DR is jammed into rec709 using gamma and color space mapping - each different for each camera/manufacturer, so the IRE value respectively.

In other words - it's highly questionable method, I'd rather stick with something like Ansel Adams exposure theory, which I'm actually using from the film days. But as I understand you just want to be more precise, which is imho still impossible without the camera.

Do you have any advice on a quick way to start lighting the scene without waiting to have the camera up? Say for example I have a reference and I want to light it similar to it. How do I estimate how bright to place the lights with a meter if I know what aputure, iso, and shutter I'm at?