Lightroom 6: Issues with clipping of details in highlights for Canon eos 70D dng files

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  • Updated 2 years ago
  • (Edited)
Lightroom loses a lot of details in the highlights for dng files generated from raw files from Canon eos 70D.

DNG files has been generated by separate users and the problem persists. Not a local issue.

How it looks in other raw compatible programs:


How it looks in lightroom:


Showing where the highlight details have clipped in LR:


Link to related post on Magic Lantern forum:
http://www.magiclantern.fm/forum/inde...
The issue has partially been investigated by the gents over there with some conclusions.

Seems to be errors in the profile for 70D in LR.

Original cr2 file:
https://drive.google.com/file/d/0B54-...
(taken with the widely used 'dual iso' feature if magic lantern, not an issue here)

Generated (using the widely used cr2hdr.exe, not an issue either) dng file:
https://drive.google.com/file/d/0B54-...

No fault was found in the dng files and the related conversion process. This should be an issue with lightroom itself and the camera profile there.
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Aaaaded Dfogog

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Posted 2 years ago

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Kelly C., Senior Lightroom QE

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Thanks. We'll look into it.
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Kelly C., Senior Lightroom QE

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@Aaaaded Dfogog ,

The file at the link above doesn't appear to be an "original CR2". If you can provide the original file and a clear set of steps to reproduce the issue, we'd be happy to investigate further.
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Aaaaded Dfogog

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The cr2 provided is the original, just unprocessed by cr2hdr.exe ( https://builds.magiclantern.fm/jenkin... )

Converting that cr2 file to dng should result in the same clipping of details.
What that processing executable does is interpolation and corrections to allow for additional dynamic range to be gained from the cr2 where two sets of iso has been used in an alternating scan of the sensor.

Link to forum post of dualiso for in depth info about that: http://www.magiclantern.fm/forum/inde...

To process the cr2 drag and drop it on the cr2hdr.exe when that with the exiftool dcraw has been extracted. This will output the dng file.

The issue is clearly in lightroom. Whether this is because of its better adherence to standards or something like that it is clear that other softwares out there handles these dng files differently.