From mboxrd@z Thu Jan  1 00:00:00 1970
From: Karl Voit <devnull@Karl-Voit.at>
Subject: Re: Screenshot of agenda: agenda is not shown in time
Date: Fri, 15 Apr 2016 17:39:10 +0200
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* Michael Welle <mwe012008@gmx.net> wrote:
> Hello,

Hi Michael!

> Karl Voit <devnull@Karl-Voit.at> writes:
>
>> I'd like to get a screenshot (PNG) of an agenda of mine by following
>> snippet:
[...]
>>   (sleep-for 1)
> waits without updating the display. Mayby that is the problem? Try
> sit-for.

You seem to have found the root cause. What works at my side:

(defun my-export-month-agenda-to-png-via-screenshot()
  (interactive)
  (org-agenda nil "n") ; generates agenda "n" (one month without todos)
  (if (my-buffer-exists "*Org Agenda*")
  (switch-to-buffer "*Org Agenda*")
    (org-agenda-list)
    )
  (message "Waiting for Screenshot ...")
  (sit-for 1)
  (message "Say cheese ...")

  (setq myoutput
        (shell-command-to-string "/usr/bin/import -window root /home/vk/agenda.png"))
  (message (concat "Screenshot done (" myoutput ")"))
  )

HTH

-- 
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