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Re: [K12OSN] Teacher Tool

Robert Arkiletian wrote:
On 3/9/07, Peter Scheie <peter scheie homedns org> wrote:

Robert Arkiletian wrote:
> On 3/8/07, Kemp, Levi <lnkemp 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

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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