Scene luminance has nothing to do with exposure.

stop and think about it if your cameras histogram is based on the distribution of data within a color space what happens if you use a larger color space than the color space your camera is presenting data and how it falls within that histogram?

as i said look closer at the histogram and the image. there is no white in the image.

I have, have you?

You just stated

that sounds white to me

you havent answed my question yet. what does your camera histogram read in the brightest RGB value ?

You are both not answering each other's questions 😄

You haven't answered Ian's questions

or his other questions 🙂

Well it is kind of a silly question the brightest value would be 255 255 255
as that the is the furthers to the right value within color space of my cameras histogram

My cameras histogram measures values that fall within the color space that is selected in my camera and distributes them in a graph that ranges from 0-255 for the three color channels
Change that color space and how they are distributed within that graph will change

your avoiding the question. but i thought thats what you and danno would do.
you own cameras with inferior tools so you lift in post.

You asked what it measures and Ian gave you the correct answer.

You still haven't answered Ian's questions I reminded you earlier.

Jpeg 😂🤣

That is a big assumption, a great deal of time I do not lift in post. I however like to ETTR for much of my work to help reduce noise

I also like to understand what processing is being done and what color spaces do to how a scene is represented in that color space
Using the wrong color space and trying to recreate those colors within a color space can introduce clipping that was never present in the raw data.

I would think that someone with your knowledge would know this but from the looks of this this be beyond what you understand because you can not even answer the simple question as to what would happen if you use a color space that is smaller or larger than the histogram represented in the camera selected color space.

You really do not understand and you have been at it for 1300 posts

You are changing what I posted. I never said that

Thank you Ian,

you just gave me the final piece to my puzzle that my sony camera in fact and can prove the histogram is a raw histogram. thankyou.

and BTW setting the zebras to 109+1 does not change the raw histogram at all. the histogram is independent.

Now let the games begin as how did i stumble across the evidence. off you go boys and try to figure it out.

Nope, that is not true. Your camera's histogram is not a raw histogram 🤣

And you are still running away from Ian's questions

If you ask the engineers at Sony I can guarantee you 100% they will tell you the same thing