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Re: Generate and insert Face header from jpg file

From: Adam Sjøgren
Subject: Re: Generate and insert Face header from jpg file
Date: Sun, 31 Jul 2022 12:15:13 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

Satoshi writes:

> (setq message-required-headers
>       (nconc message-required-headers
>              (list '(Face . (lambda ()
>                               (gnus-face-from-file "~/face.jpg"))))))
> But I couldn't generate and insert Face header at writing a mail.

What happens when you try? Do you get an error message?

You have chosen to use gnus-face-from-file and a JPEG - the
documentation says that it uses gnus-convert-image-to-face-command to
convert the image to PNG:

,----[ C-h v gnus-convert-image-to-face-command RET ]
| gnus-convert-image-to-face-command is a variable defined in ‘gnus-fun.el’.
| Its value is "convert -scale 48x48! %s -colors %d png:-"
| Command for converting an image to a Face.
| The command must take an image filename (first format argument
| "%s") and the number of colors (second format argument: "%d")
| as input.  The output must be the Face header data on stdout in
| PNG format.

Do you have ImageMagick installed on your machine (i.e. the package that
contains the "convert" command)?

To eliminate that potential source of problems you could save the image
as a PNG and use gnus-convert-png-to-face instead.

  Best regards,


 "perhaps he does not understand that business needs        Adam Sjøgren
  to be run without idiot balloons or child games."

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