[K12OSN] Teacher Tool

Peter Scheie peter at scheie.homedns.org
Fri Mar 9 20:33:15 UTC 2007

Robert Arkiletian wrote:
> On 3/9/07, Peter Scheie <peter at scheie.homedns.org> wrote:
>> Robert Arkiletian wrote:
>> > On 3/8/07, Kemp, Levi <lnkemp at bolivar.k12.mo.us> wrote:
>> >> Is there a way in teacher tool to monitor the screens of all the
>> >> students, even if it is a smaller size? If not does anyone know how I
>> >
>> > This seems to be a popular request but the only way I currently know
>> > how to do this is to simply set the -geometry option in the vncviewer
>> > call. I also could probably get the vnc windows to arrange themselves
>> > on screen not to overlap. But if the student desktop is 1024x768 and
>> > each view window (on the teacher screen) is 320x200 (or something)
>> > then you don't see the entire student desktop only a section (not
>> > useful). Does anyone know of a way to scale a vnc session to create a
>> > thumbnail?
>> >
>> There's a package on freshmeat called VNC Snapshot that is a 
>> commandline utility that
>> takes a jpeg snapshot of a VNC server (the client machine in our 
>> case).  Perhaps with
>> that you could scale the jpegs down to thumbnail size and create a 
>> 'board' with
>> snapshots of the clients.  It's not real-time, but I think that's 
>> probably better, as a
>> bunch of real-time thumpnails would tax the network.  VNC Snapshot is at
>> http://vncsnapshot.sourceforge.net/
> This is the best idea I have seen. Thanks Petre. You are right, real
> time thumbs would probably be too much for the network. I will see if
> I can integrate vnc snapshot. Might not happen till this summer as I
> am bogged down with report cards and teaching.
Further, you may want to have a look at jpgtn which generates thumbnails from jpeg 
files.  See http://jpgtn.sourceforge.net/


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