[wp-trac] [WordPress Trac] #58082: Import metadata description from Darktable into media caption in WordPress (was: Import metadata description from darktable into media caption in wordpress)

[WordPress Trac]

#58082: Import metadata description from Darktable into media caption in WordPress
--------------------------+------------------------------
 Reporter:  fotodrachen   |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Media         |     Version:  6.2
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
--------------------------+------------------------------
Changes (by sabernhardt):

 * component:  Administration => Media


Old description:

> Wordpress 6.2 in interaction with Darktable 4.2.1
>
> It should be possible to set **Metadata** in the Photo-Editor "Darktable"
> that can be used as "caption" (and "title") in WordPress without typing
> it once again.
>
> In Darktable there are 3 metadata-fields in the internal database: title,
> descripton, notices.
> While exporting from Darktable to JPEG the metadata can be written into
> the JPG-file. There are 3 groups of metadata: **EXIF**, IPTC and Xmp.
>
> Darktable writes EXIF and Xmp.
> WordPress reads EXIF and IPTC.
> So only EXIF can be used.
>
> Darktable writes only the "description" into the EXIF-group, the fields
> "title" and "notices" only in Xmp.
> So only the Darktable-field "descrition" can be used für WordPress-
> caption and title.
>
> If the description has "ASCII only" characters, Darktable exports the
> description to "EXIF ImageDescription field".
> If the description contains some special characters (like in german ä ö
> ü), then Darktable writes the Description to "**EXIF UserComment
> field**".
> So "EXIF ImageDescription field" **OR** "EXIF UserComment field" is
> filled, **but never both**.
>
> The "EXIF UserComment field" is not imported to the WordPress-caption
> when "EXIF ImageDescription field" is empty (wrong if-structure?).
>
> So at least only descriptions with "ACSII only"-characters are imported
> from darktable, texts with special national characters are lost.
>
> Please enable the import of the "EXIF UserComment field".
>
> Source-code is: function "wp_read_image_metadata()" in /wp-
> admin/includes/image.php.
> Inserting this 7 lines of code at line 877 solved the problem for me:
>
> {{{#!php
> <?php
> // }
> } elseif ( empty( $meta['caption'] ) && ! empty(
> $exif['COMPUTED']['UserComment'] ) ) {
>         $meta['caption'] = trim( $exif['COMPUTED']['UserComment'] );
>         $description_length = strlen( $exif['COMPUTED']['UserComment'] );
>         if ( empty( $meta['title'] ) && $description_length < 80 ) {
>                 $meta['title'] = trim( $exif['COMPUTED']['UserComment']
> );
>         }
> }
> }}}
>

>
> Dokumentation in German: https://fotodrachen.de/wp/wordpress-
> bildunterschrift-aus-darktable-metadaten-auslesen/
>
> On long term it could be usefull also to import metadata from the Xmp-
> group, for example to get different description and title.

New description:

 WordPress 6.2 in interaction with [https://www.darktable.org/ Darktable]
 4.2.1

 It should be possible to set **Metadata** in the Photo-Editor "Darktable"
 that can be used as "caption" (and "title") in WordPress without typing it
 once again.

 In Darktable there are 3 metadata-fields in the internal database: title,
 description, notices.
 While exporting from Darktable to JPEG the metadata can be written into
 the JPG-file. There are 3 groups of metadata: **EXIF**, IPTC and Xmp.

 Darktable writes EXIF and Xmp.
 WordPress reads EXIF and IPTC.
 So only EXIF can be used.

 Darktable writes only the "description" into the EXIF-group, the fields
 "title" and "notices" only in Xmp.
 So only the Darktable-field "description" can be used for WordPress-
 caption and title.

 If the description has "ASCII only" characters, Darktable exports the
 description to "EXIF ImageDescription field".
 If the description contains some special characters (like in german ä ö
 ü), then Darktable writes the Description to "**EXIF UserComment field**".
 So "EXIF ImageDescription field" **OR** "EXIF UserComment field" is
 filled, **but never both**.

 The "EXIF UserComment field" is not imported to the WordPress-caption when
 "EXIF ImageDescription field" is empty (wrong if-structure?).

 So at least only descriptions with "ASCII only"-characters are imported
 from darktable, texts with special national characters are lost.

 Please enable the import of the "EXIF UserComment field".

 Source-code is: function `wp_read_image_metadata()` in `/wp-
 admin/includes/image.php`.
 Inserting this 7 lines of code at line 877 solved the problem for me:

 {{{#!php
 <?php
 // }
 } elseif ( empty( $meta['caption'] ) && ! empty(
 $exif['COMPUTED']['UserComment'] ) ) {
         $meta['caption'] = trim( $exif['COMPUTED']['UserComment'] );
         $description_length = strlen( $exif['COMPUTED']['UserComment'] );
         if ( empty( $meta['title'] ) && $description_length < 80 ) {
                 $meta['title'] = trim( $exif['COMPUTED']['UserComment'] );
         }
 }
 }}}

 Documentation in German: https://fotodrachen.de/wp/wordpress-
 bildunterschrift-aus-darktable-metadaten-auslesen/

 On long term it could be useful also to import metadata from the Xmp-
 group, for example to get different description and title.

--

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/58082#comment:1>
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