Subject: bug#8681: 23.3; (gnus-face-from-file ...) bug in Gnus v5.13 on GNU Emacs 23.3.1 (i386-mingw-nt5.1.2600) on Windows XP Professional, Service Pack 3

From: Eli Zaretskii <[email-masked]>
Date: Thu, 30 Jun 2011 10:23:35 -0400

> From: Lars Magne Ingebrigtsen <[email-masked]>
> Cc: [email-masked]
> Cc: Glenn Morris <[email-masked]>,  Eli Zaretskii <[email-masked]>,  [email-masked]
> Date: Thu, 30 Jun 2011 16:14:27 +0200
> 
> (shell-command "convert -scale 48x48! c:/some/image.jpg -colors 10 png:-")

I would rather suggest to start with this:

  M-: (executable-find "convert") RET