[wp-trac] [WordPress Trac] #58082: 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:  Administration  |    Version:  6.2
 Severity:  normal          |   Keywords:
  Focuses:                  |
----------------------------+-----------------------------
 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.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/58082>
WordPress Trac <https://core.trac.wordpress.org/>
WordPress publishing platform