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Apparently image-dired provides Functions to write and extract Exif comments using ExifTool but I can't find any of those functions using e.g. M-x except image-dired-copy-with-exif-file-name.

In particular I want to display the tag value Description from the selected thumbnail in the minibuffer.

1 Answer 1

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That's because everything else is not a command, so you can't invoke it with M-x. Try M-: (image-dired-get-exif-data <FILE> <TAG>).

Note by the way that Emacs 29.1 has obsoleted this mechanism. C-h f image-dired-get-exif-data says:

image-dired-get-exif-data is a native-compiled Lisp function in
‘image-dired.el’.

This function is obsolete since 29.1; use ‘exif-parse-file’ and
‘exif-field’ instead.

(image-dired-get-exif-data FILE TAG-NAME)

From FILE, return EXIF tag TAG-NAME.

  Probably introduced at or before Emacs version 29.1.

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