It already has been proven many times over by multiple members in this thread.
Are you still claiming one of those histograms in your op are a histogram of the actual raw data in the raw datafile?
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maybe you should do some reading if you actually have photoshop
helpx.adobe.com/au/photoshop-elements/using/color-camera-raw.html -
Are you still claiming one of those histograms in your op are a histogram of the actual raw data in the raw datafile?
That Adobe article clearly shows the histogram in ACR is not a histogram of the data in the actual raw file. It says the ACR histogram is a histogram of the processed raw data.
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you seem to be in the begginer section alot heres another link for you
helpx.adobe.com/au/camera-raw/using/introduction-camera-raw.html
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Are you still claiming one of those histograms in your op are a histogram of the actual raw data in the raw datafile?
A simple yes or no will suffice :-)
That Adobe article as well clearly shows the histogram in ACR is not a histogram of the data in the actual raw file. It says the ACR histogram is a histogram of the processed raw data.
You are actually unknowingly, because you most likely haven't read either article, posting evidence proving you were at best naive at worst foolish in trying to pass off the ACR histogram as a raw histogram.
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This thread started out with two histograms and no explanation. To someone new, this could be confusing. It then devolved into some discussion about loading files in to ACR - also confusing to someone who doesn't know what ACR is. At this point, we started to get personal degredation - which I think is not needed in any post or thread - so I'd like it to stop.
Can we go back to the original premise of this post please? What is a raw histogram and why does it matter? I have not seen an answer to that.
Alan
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To summarise this thread:
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To me the "Fiddlers" bottle reflextions look like clipping, while the RAW data shows none. What am I missing?
And the brush also. -
DannoB, thank you. I was happy with your reply right up until the last sentence. You did not need to add that.
Alan
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Exactly.
Thanks for your intervention.
I acted discretely way before, without being listened :-( -
Fair enough. Point taken and I have deleted the last line. It was my Bad.
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This file is about one stop underexposed from ETTR, assuming a 14 bit ADC.
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Well, I see we're enjoying the more open environment here in this DPR spinoff forum. That's good. I wouldn't want to see your post deleted or the thread locked because of it, which would have happened with your post in the Canon R forum at DPR. In the spirit of free exchange, I would say that questioning of Donalds's photographic professionalism is irrelevant and unnecessary. There are plenty of people who deliver professional quality photographs consistently to clients, who don't know much about what data and math goes on, under the hood, in a camera. There are probably also people who are so intimate with the workings and properties of raw digitization who could write code to remove known artifacts from raw files, who would be a risk as an event photographer.
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You make valid points and to help alleviate people's concerns this thread has had a hidden benefit as well.
DonaldB and I just finished going through a mediation process with Admin and from my point of view it went well as it resulted in a positive outcome for both of us. I feel the mediation was a good test case.
The mediation process was much better handled than the heavy handed moderation that would most likely have occurred if we were still on dpreview.
Hopefully the mediation process will be adopted and successful here on dprevived.
We can go back on topic now :-)
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Jim,
Why is the number of bits in the ADC relevant here?
Where does the "one stop" come from?
Thanks
Sherm -
Yes, there are a few small things to know when interpreting a raw histogram. You want to know what raw level data actually starts clipping at (which is often not the max value of a bit depth), and also, what raw level data becomes non-linear at, if a camera offers part of the non-linear range. My first DSLR (and my first camera with raw files), the Canon 10D, went non-linear in the highest raw values at ISO 100. ISO 200 clipped at about 22K electrons, but ISO 100 clipped at about 55K, 25% more than expected based on ISO 200. Some people had stated the FWC of the 10D at about 44K, but apparently they looked at SNR well below clipping and just extrapolated the FWC from that without checking for non-linearity.
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I thought your post that I replied to was very recent when I replied, and didn't realize that it was already addressed. I wouldn't have replied if I realized that.
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No problem. As I mentioned, you made valid points.
