A question to owners of Pro Canon Cameras or Recent Canon Cameras

When you open a raw file in DPP, do you see the same RAW Histogram as in the following pic ? I mean do you have 2 gray columns in each side and do they have the same size as in the pic below ? or is the white surface wider ? Thanks.


Digital Rebel

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Well, my 5D Classic and 1D3 both have the gray stripes, although on both the left edge of the right stipe, where the white point line starts (by default) is a bit more to the right.

I don't know what the purpose/function of those gray zones is -- I can't find a way of getting them to budge and you can't evidently drag the white or black point lines into the gray zones. Tried switching to Linear and it didn't change things either.

But I only have Raw files from those two and nothing from a newer body.

So, I plead ignorance!

The white area is about the same width but placed differently. The left edge of the white is at exactly -8.0 and the right edge of the white is even with the right edge of the 0 in "4.0".
I checked with several different photos and they were all the same. I have a 450D that's about 8 months old.

Hmm, interesting -- it soulds like there is slight variations between all three -- I wonder if it's camera related, or just a bit of a difference between software, systems, displays...?

I think it's camera related. Each sensor has it's own dynamic range. The wider white surface, the higher dynamic range.
It seems that the 450D can get more information in brighter situations and less information in darker ones.

tonylong wrote in post #11425782
Hmm, interesting -- it soulds like there is slight variations between all three -- I wonder if it's camera related, or just a bit of a difference between software, systems, displays...?

Based on my extensive, long-term experience and knowledge of how all these things work, I feel pretty sure that I don't have a clue!

I have no idea what it means but my 5DII shows the upper end, almost at the -4 mark and about the same as the OP's at the other end. The 5D looks the same. The 40D is a bit lower at the top end compared to the 5D/5DII. The 7D is similar to the 5DII/5D.

The white represents the signal range from black to white in the native A/D converter (raw data) resolution. The gray represent hard stops or areas that are invalid. Signals close to white have higher resolution (more steps per zone, Ansel Adams zone system) than signals close to black.

bohdank wrote in post #11425963
I have no idea what it means but my 5DII shows the upper end, almost at the -4 mark and about the same as the OP's at the other end. The 5D looks the same. The 40D is a bit lower at the top end compared to the 5D/5DII. The 7D is similar to the 5DII/5D.

Could you please post the 40D and the 7D histograms in this thread ? : https://photography-on-the.net/forum/showthre​ad.php?t=969927
Thanks

Done. I also added the 5DII.

bohdank wrote in post #11426084
Done.

Thanks !

I loaded my histogram to the new thread...

Heh! I had a hilarious time accomplishing that simple task, though -- simple, as long as I can look back and chuckle at my trials and adversities!

I've been working with my little laptop, which does have DPP but doesn't have Lightroom or Photoshop, it does not have an editor I'm familiar with -- Paint has been "remodeled" for Win7 (maybe Vista) and doesn't have the old familiar Windows menus, just toolbars that seem to change around willy-nilly...

And, a while back the battery-powered wireless mouse I had been using died, so I decided to make myself get used to using the fingerpad, which I hate because it always does crazy stuff I don't want, but I've been toughing it out, not changing any settings and only disabling it when I'm typing out something and I can't afford it going crazy on me (learned by experience).

So, bumbling through getting my screenshot open in Paint, cropped and sized and saved, and then using the Attach function here, all with the finger pad doing its usual crazy stuff...hilarious...

It might be of interest to note that when Highlight Tone Priority is enabled the histogram shifts approximately one stop to the right. Attached is from a 5D2. The 40D shows the same shift.

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tonylong wrote in post #11426516
I loaded my histogram to the new thread...

Heh! I had a hilarious time accomplishing that simple task, though -- simple, as long as I can look back and chuckle at my trials and adversities!

I've been working with my little laptop, which does have DPP but doesn't have Lightroom or Photoshop, it does not have an editor I'm familiar with -- Paint has been "remodeled" for Win7 (maybe Vista) and doesn't have the old familiar Windows menus, just toolbars that seem to change around willy-nilly...

And, a while back the battery-powered wireless mouse I had been using died, so I decided to make myself get used to using the fingerpad, which I hate because it always does crazy stuff I don't want, but I've been toughing it out, not changing any settings and only disabling it when I'm typing out something and I can't afford it going crazy on me (learned by experience).

So, bumbling through getting my screenshot open in Paint, cropped and sized and saved, and then using the Attach function here, all with the finger pad doing its usual crazy stuff...hilarious...

Thanks for the effort !

tzalman wrote in post #11426881
It might be of interest to note that when Highlight Tone Priority is enabled the histogram shifts approximately one stop to the right. Attached is from a 5D2. The 40D shows the same shift.

The gray zone then is a graph buffer (and hard stop) and the white zone represents actual potential resolution and distribution of data. One graph many cameras hence the shifts.