Canon 6D Mark II over exposed in LrC

Report · Jun 02, 2022

I purchased a Canon 6D Mark II to use for real estate photography, and also own a Canon 90D.

The raw CR2 images from the 6DII consistantly show over exposed by a full stop in LrC. I cannot figure out why, I assume the profile for a camera this old should be accurate by now. I do not see the same issue with the 90D CR3 files.

This is a comparison of the same unprocessed CR2 file in Canon DPP4 vs. LrC:

Thanks for any insight.

Report · Jun 02, 2022

There is nothing in either product that tells you about a raws exposure (over or otherwise); one IS brighter than the other. The only way to view exposure of raw is with a product that has a raw Histogram (like RawDigger*). Now if you can upload an raw to something like Dropbox or similar, I'd be happy to show you the raw Histogram.

The two images you see are being handled differently due to two different proprietary raw processors so you can't expect them to match. It is possible you could make one match the other and vise versa. The brighter image you see in LR is simply due to the current rendering settings applied to that raw data. Nothing to do per se with actual exposure (that is only an attribute of aperture and shutter applied to the sensor).

Camera profiles have nothing to do with accuracy.

None of the images you've shown us are unprocessed. That isn't the case with RawDigger.*

* https://www.rawdigger.com

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"

Report · Jun 05, 2022

This is the same exact file, in two different raw file processors: DPP4 (Canon's software) and LrC (Adobe's industry standard software), unprocessed as in no adjustments made in either software to exposure.

The histogram is one full exposure different in LrC. This doesn't happen with any of my other cameras, only the Canon 6Dm2.

Here is a THIRD editor, RawTherapee. It also matches DPP4, which will always be the most accurate since it is Canon's software, but NO editor should be one full stop over exposed out of camera with no adjustments made in the editor yet.

This is a problem in LrC that needs to be addressed by Adobe.

Report · Jun 05, 2022

@BigJoeVA68 wrote:

This is the same exact file, in two different raw file processors: DPP4 (Canon's software) and LrC (Adobe's industry standard software), unprocessed as in no adjustments made in either software to exposure.

The histogram is one full exposure different in LrC. This doesn't happen with any of my other cameras, only the Canon 6Dm2.

Here is a THIRD editor, RawTherapee. It also matches DPP4, which will always be the most accurate since it is Canon's software, but NO editor should be one full stop over exposed out of camera with no adjustments made in the editor yet.

This is a problem in LrC that needs to be addressed by Adobe.

Let me repeat again: there is nothing in either product that provides information about exposure and each differs due to the proprietary means of which their current settings are applied. There is no 'No adjustments' in either product. There are defaults or settings of zero. But there ARE adjustments.

Again, until you provide us a raw, you cannot be provided any data about actual exposure. Unless you have something like RawDigger; do you?

You seem again to be confused between brightness (from rendering) and exposure which only takes place at image Capture.

Hence, articles on exposing for specifically and only raw:
http://www.onezone.photos
http://schewephoto.com/ETTR/
https://luminous-landscape.com/the-optimum-digital-exposure/
http://digitaldog.net/files/ExposeForRaw.pdf
https://www.fastrawviewer.com/blog/mystic-exposure-triangle
https://www.fastrawviewer.com/blog/red_flowers_photography_to-see-the-real-picture
https://www.rawdigger.com/howtouse/exposure-for-raw-or-for-jpegs
https://www.rawdigger.com/howtouse/beware-histogram
https://www.rawdigger.com/howtouse/calibrate-exposure-meter-to-improve-dynamic-range

BTW, this is what a raw would look like with NO adjustments:

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"

Report · Jun 05, 2022

I am not confused at all. I perfectly understand the exposure triangle, I am a professional photographer and also an engineer.
YOU seem confused. This is a single file, a single data set, the data is exactly the same in every editor that opens it.

Let me repeat again: THE SAME EXACT FILE shows a different exposure in a SINGLE editor out of more than one. By a full stop. How do I know it is a full stop? Because if I use the exposure slider in LrC to reduce it a full stop, like magic, it then matches the other editors.
The ones and zeros are the same for every editor, you have no need to see them at all, it is irrelevant to the problem. If the number is '135' and every editor shows '135' except one that shows '235' then the problem isn't the file, it is the interpretation by the single program getting it wrong.
Please stop the condescention and self promotion. It is tedious.

Report · Jun 05, 2022

@BigJoeVA68 wrote:

I am not confused at all. I perfectly understand the exposure triangle....

https://www.fastrawviewer.com/blog/mystic-exposure-triangle

Correct lightness ≠ correct exposure

@BigJoeVA68 wrote:

Let me repeat again: THE SAME EXACT FILE shows a different exposure in a SINGLE editor out of more than one. By a full stop.

No, it doesn't. Let me repeat, the difference isn't anything but brightness and you have no data on exposure based on what you report. Again, let me repeat; when you provide us a raw, some here can provide the exposure of that raw, using a product designed to do so. You as yet haven't used the proper tool to do so.

You have no data that LR is doing anything wrong. It is doing something different. It is brighter than another product.

Do you need help in reducing brightness using this Adobe product? Just ask.

If you want to know the actual exposure of the raw, upload one.

You asked us, you came here stating:

"I cannot figure out why, I assume the profile for a camera this old should be accurate by now". Thanks for any insight.

No need for assuming. This has nothing to do with accuracy. A .DCP profile have nothing to do with (actual) exposure. Upload a raw, better yet, a DNG with your edits, tell us what version of LR you're using. Then maybe we can make progress.

LR can't alter exposure. No raw converter can. Exposure only takes place at capture.

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"

Report · Jun 05, 2022

Please, just stop. Seriously.

Three cameras. FOUR editors. Only ONE image showing incorrecty, the one for the Canon 6Dii, in LrC only. The other two cameras show the same exposure for all four editors.

No editor should show an exposure a full stop incorrectly. Period. End of story.

Just stop. Seriously.

Report · Jun 05, 2022

I'm sorry the facts how how exposure really works (outside all raw converters) have ruined your day.

Yes indeed, we are done now.

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"

Report · Jun 05, 2022

A raw (CR2) file from a Canon 6Dii read by LrC shows a histogram pushed to the right by a full stop. This doesn't match 3 other editors, including Canon's DPP4 which all show the same exposure. Sliding the exposure slider down by a stop places the histogram and image in LrC to match the other three raw editors.

This issue does not happen with CR3 files from my 90D:

Or my Canon hybrid camera:

Only the 6Dii files seem to be interpreted incorrectly by LrC.
I realize a preset to adjust exposure down a stop could be applied on import, but would prefer that LrC interpret the data correctly without manual modification.