Where you are stuck seems to be thinking that I expect a histogram to be 1:1 to the final image.
No, where you are stuck seems to be thinking the tool is honestly defined for it's task. It isn't!
If I were to show you a Histogram of an image that is in ProPhoto RGB represented as sRGB, you're being lied to. If I tell you you're driving 55MPH and you're doing 66MPH, you'er being lied to. If you are driving 55MPH and the meter tells you 56MPH, not really an issue. The disconnect between a JPEG histogram in sRGB (maybe Adobe RGB (1998) ) and the raw data isn't 1MPH out of bounds! I asked you once, I'll ask you a 2nd time. Do you have a raw converter that will show you the
actual raw Histogram? If not, I guess I'll try to spends some time making a screen shot for you of it and what the lie on the back of the camera tells me when I properly exposure for raw (NOT JPEG). It's not close. If you like being lied to, I'm OK with that and as I said, my only objection would be you attempting to pass this off to others as acceptable when we could (and can in some cases) get a Histogram that shows is what the data really is. That's not happening in your methodology. Please remember the old sayings about making assumptions and '
close enough for..." That's exactly where the '
use a JPEG Histogram for raw' falls flat.
I don't need to look at a lie and interpolate it into an '
educated guess'. I was exposing film years before anyone had an idea what an image Histogram was. I don't need to guess. Proper exposure is basic photography! It's not difficult to properly expose these differing media, been done for over 100 years.
You look at the LCD, zoom in and see the image is out of focus, it is out of focus! You view the LCD and see you cut off some's head, it's cut off! You view the Histogram, you're viewing the rendered JPEG the proprietary camera electronics produced which isn't the raw. It's as simple as that.
Please tell me, outside this camera LCD Histogram lie, where else you are shown that plotting of data that
isn't representing the data as it really is. This Histogram as a tool is excellent for when the camera is set for JEPG and a kludge and lie when shooting raw. The answer isn't to continue to accept the lie, the answer is to demand the camera manufactures provide the truth about the data and stop accepting that the lie is '
close enough'.