Re: pixel problem...

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Dirk Reiners (reiners++at++ecrc.de)
Fri, 5 Sep 1997 15:23:21 -0600

On Sep 5, 2:03pm, Charlie H. Chang wrote:
> Subject: pixel problem...
> Hi,
>
> In our application we need to output four 640x480 and four 320x240
> channels.
> We use DG4-8 on our Onyx2 IR (R10000) machine and have 8 VGA
> monitors conneted to the output ports. The problem is that those
> 320x240
> images get scaled up on the VGA monitors and cover the whole screen, and
> we
> would like to make the image to be displayed at the center of the screen
> and covering
> 1/4 of the screen area.
> Is there anyway to do that?
> Thank you in advance!
>
>-- End of excerpt from Charlie H. Chang

Two ideas:

1. Make all the output channels 640x480 and add a black border around your
320x240 channels. You will need to make your X display area bigger and might
take a hit on pixel depth (don't have an iR handy to try). And this also
assumes that the 320x240 are not just zooms into parts of other displays but
are separate channels.

2. Create your own video output format that uses longer front and back porches
so that only 320x240 is displayed in the middle of the screen. I have no idea
if the monitor can handle that or if it works at all, but that's the only
chance I see. Take a look at http://www.sgi.com/Products/software/vfc/ on how
to do your own video formats.

Hope it helps

        Dirk

-- 
-- Dirk Reiners                 reiners++at++ecrc.de, reiners++at++igd.fhg.de  
-- ZGDV - AR Group                   http://www.igd.fhg.de/~reiners
-- Arabellastr. 17 (ECRC)             
-- D-81925 Muenchen                  All standard disclaimers apply. 
-- Truth is stranger than fiction because fiction has to make sense. 
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