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P: Save JPG as DNG breaks maker notes

Community Beginner ,
Apr 24, 2022 Apr 24, 2022

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When saving a file that was originally a JPG to a DNG file, the camera maker notes are written incorrectly and have become corrupted.

Together with Phil Harvey (author of exiftool) I analysed the issue and we found that the makernotes are copied from an area in the original file that is off by 12 bytes; the maker note data is prefixed with 12 bytes (from other metadata tags) and the final 12 bytes are missing. This is problematic as my workflow uses information from the makernotes…

 

The problem has been around for a while and is still present in the latest verion of camera raw (14.3).

 

If you need, I can provide example files.

 

Hope you can fix this soon,
Hayo Baan

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correct answers 2 Correct answers

Adobe Employee , Jun 14, 2022 Jun 14, 2022

Greetings,

 

Updates to the Adobe Photography Products were released on June 13. The update contains a fix for this issue.  Please download and the latest version of your application via the Adobe Creative Cloud Application or your respective device app store.

If you do not see the update (Mac and Win) you can refresh your Creative Cloud App with the keyboard shortcut [Ctrl/Cmd]+[Alt/Opt]+[ R ]. 

 

Note: App store availability can take several days for the update to appear and be available. 

 

T

...
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Adobe Employee , Apr 27, 2022 Apr 27, 2022

Setting status to investigating
Adding bug number 

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15 Comments
LEGEND ,
Apr 24, 2022 Apr 24, 2022

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Gotta ask: Why would you save a JPEG inside the DNG container? 

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

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Community Beginner ,
Apr 24, 2022 Apr 24, 2022

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Because then I can edit the JPG and treat the JPG as if it where a RAW file with all advantages that brings me (single file, non-destructive editing, etc.). Sure I could have saved it as a TIFF with a smart object, but my whole workflow is centered around (dng) raw files, so this is more convenient to me 😉

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LEGEND ,
Apr 24, 2022 Apr 24, 2022

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No, you can't. It's just a JPEG inside the DNG container, it isn't any more 'raw' and of course, you could just continue parametric edits of the JPEG in either LR or ACR. Both products allow editing of the JPEG this way without any need to 'convert' (which is simply embedding) the JPEG into that container. 

Embedding a JPEG into a DNG isn't doing anything useful; it is still a JPEG. 

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

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Community Beginner ,
Apr 24, 2022 Apr 24, 2022

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YES, I understand that, of course.

But for my whole worflow it is critical the preview in the file is what the end result will look like.

With a JPG (or non-DNG raw files) and separated edits that just isn't the case. With the DNG you can have the embedded preview reflect the end result. This allows me to browse with other software (I use PhotoMechanic for instance, but also the Finder then shown me the result of the edits) and see what the final image will look like. This is VERY important to me.

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LEGEND ,
Apr 24, 2022 Apr 24, 2022

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Using a JPEG in ACR/LR will preview the file as the end results will appear. 

Yeah, outside, it will not. Because you haven't rendered the edits. 

But if you are clear that you are not treating the JPG as if it were a RAW raw file, fine. Some incorrectly believe that embedding a TIFF or JPEG into DNG makes it raw, seems we both agree, it doesn't. 

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

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Community Beginner ,
Apr 24, 2022 Apr 24, 2022

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Indeed we fully agree: it doesn't make it a real raw. It's still the same source data, just in a container (allowing you to combine it in one file with the parametric edits and a rendered preview, but it won't make the source data any different).

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Community Beginner ,
Apr 24, 2022 Apr 24, 2022

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Why was this moved from BUGS to DISCUSSIONS? This IS a bug!

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LEGEND ,
Apr 24, 2022 Apr 24, 2022

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I didn't move it. 

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

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Community Beginner ,
Apr 24, 2022 Apr 24, 2022

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I didn't think you did, but it was moved nonetheless, hence my question...

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Community Beginner ,
Apr 27, 2022 Apr 27, 2022

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When saving a file that was originally a JPG to a DNG file, the camera maker notes are written incorrectly and have become corrupted.

Together with Phil Harvey (author of exiftool) I analysed the issue and we found that the makernotes are copied from an area in the original file that is off by 12 bytes; the maker note data is prefixed with 12 bytes (from other metadata tags) and the final 12 bytes are missing. This is problematic as my workflow uses information from the makernotes…

 

The problem has been around for a while and is still present in the latest verion of camera raw (14.3).

 

If you need, I can provide example files.

 

Hope you can fix this soon,
Hayo Baan

 

P.S. This is a repost as my original post inadvertently got moved to “Discussions” but it is definitely a bug.

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Adobe Employee ,
Apr 27, 2022 Apr 27, 2022

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Greetings,

 

The Camera Raw team would like to obtain a sample JPEG file and DNG that exhibit the problem, can you supply a set of files for us to review?

Rikk Flohr - Customer Advocacy: Adobe Photography Products

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Community Beginner ,
Apr 27, 2022 Apr 27, 2022

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Hi Rikk, sure I can. But actually any JPG with makernote data saved as DNG will do (e.g. from an iPhone).
I've uploaded  a sample (both the JPG and the DNG) as well: https://we.tl/t-6zLOI7zGfK

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Adobe Employee ,
Apr 27, 2022 Apr 27, 2022

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Setting status to investigating
Adding bug number 

Rikk Flohr - Customer Advocacy: Adobe Photography Products
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Adobe Employee ,
Jun 14, 2022 Jun 14, 2022

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Greetings,

 

Updates to the Adobe Photography Products were released on June 13. The update contains a fix for this issue.  Please download and the latest version of your application via the Adobe Creative Cloud Application or your respective device app store.

If you do not see the update (Mac and Win) you can refresh your Creative Cloud App with the keyboard shortcut [Ctrl/Cmd]+[Alt/Opt]+[ R ]. 

 

Note: App store availability can take several days for the update to appear and be available. 

 

Thank you for your patience.

Rikk Flohr - Customer Advocacy: Adobe Photography Products
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Community Beginner ,
Jun 18, 2022 Jun 18, 2022

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Excellent: problem appears to be fixed!

Thanks 😀

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