To answer your question:

/"But why do you want to write an xmp file against the jpeg... Dt is useful to treat raw files! Xmp files are useful to preview raw files in Dt!"//
/

This is because the exported jpgs are the ones that will be used e.g. to send to others, upload to a photo album, etc.  These are the images the original raws of which  I have "treated" with DT. For one series of shoots, I do not need to work on *all* pictures. My camera produces both raw images *and* the corresponding jpg. When the latter is good enough, there is no task for DT. Consequently, for a picture that is already good, I don't want an xmp file littering around. Such a  default .xmp is misleading: if one would create a jpg-image using the info from such a default generated xmp, this generated 'default jpg"  is  (very) different from the camera generated one. Which is understandable, as the camera has its built-in knowledge how to create the jpg, which is not necessarily the same as the default actions DT would do.

Regards
Bertwim

On 2/20/21 11:59 AM, Dimitri Gathy wrote:

    My camera creates an image both in raw format (Nikon, nef) and a jpg.
    When the camera-produced jpg is good enough, I just want to keep it,
    leaving it untouched by DT. No xmp-file needed or even desired.
    For  the
    others pictures, I use DT to process the the raw image and export
    a new
    jpg, overwriting the original camera-produced jpg. For those
    pictures I
    want the xmp file.
    In other words, I would like to have  an xmp file *only* for those
    images that I have actually edited. No no xmp-files for images that I
    have not touched/edited.

    I don''t think DT is currently providing this in a convenient way. It
    can write xmp files automatically for *all* images, but that is
    too much.


I answer to your affirmation!
But why do you want to write an xmp file against the jpeg... Dt is useful to treat raw files! Xmp files are useful to preview raw files in Dt!

Le sam. 20 févr. 2021 à 10:09, Bertwim <b...@xs4all.nl <mailto:b...@xs4all.nl>> a écrit :

    Sorry Dimitry, but how does this help me implementing the export
    of xmp-files of modified images?

    Regards
    Bw

    On 2/20/21 9:49 AM, Dimitri Gathy wrote:
    In the module import, there is "parameters" & the "ignore jpegs".
    When you export, you can choose the destination. Read the manual.

    Le sam. 20 févr. 2021 à 09:43, Bertwim <b...@xs4all.nl
    <mailto:b...@xs4all.nl>> a écrit :

        I might do that, but I am considering implementing it myself.
        I am not very familiar with the darktable internals (yet),
        Perhaps somebody from this dev-list kan give some suggestions
        how to tackle the problem.



        Regards,
        Bertwim

        On 2/20/21 9:31 AM, Martin Straeten wrote:
        Then you may file a feature request at
        
https://github.com/darktable-org/darktable/issues/new?assignees=&labels=&template=feature_request.md&title=
        
<https://github.com/darktable-org/darktable/issues/new?assignees=&labels=&template=feature_request.md&title=>
 and
        be patient until someone implements it ...

        Am 20.02.2021 um 09:23 schrieb Bertwim <b...@xs4all.nl>
        <mailto:b...@xs4all.nl>:

         Hi Martin,

        Sure, but that is not what I am looking for. I don't want
        unnecessary being being generated.

        Kind Regards,
        Bertwim

        On 2/20/21 7:31 AM, Martin Straeten wrote:
        You can use the collection filters just to display edited images using 
darktable related tagging

        
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        Then ctrl+a and save xmp file

        Am 19.02.2021 um 22:46 schrieb Bertwim<b...@xs4all.nl>  
<mailto:b...@xs4all.nl>:

        Hi,

        My camera creates an image both in raw format (Nikon, nef) and a jpg.  
When the camera-produced jpg is good enough, I just want to keep it, leaving it 
untouched by DT. No xmp-file needed or even desired. For  the others pictures, 
I use DT to process the the raw image and export a new jpg, overwriting the 
original camera-produced jpg. For those pictures I want the xmp file.
        In other words, I would like to have  an xmp file *only* for those 
images that I have actually edited. No no xmp-files for images that I have not 
touched/edited.

        I don''t think DT is currently providing this in a convenient way. It 
can write xmp files automatically for *all* images, but that is too much.
        It is possible to achieve this selective xmp-export  manually by first 
selecting in lightroom the 'untouched' images, inverting this selection and then 
choose "write sidecar files' in the history stack menu. This however, is 
cumbersome, tedious and error prone. I am looking for a more robust and automated 
way to achieve the same.
        It would make sense I think to write an xmp file together with the 
export, So I was thinking if I could add this option to the code.

        I would value some comments or feedback if this option would be 
worthwhile to pursue.

        Kind Regards,
        Bertwim



        
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