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1:1 pixel mapping with custom resolutions on digital?

post #1 of 7
Thread Starter 
Does anybody know a successful case of using a custom resolution (e.g. 1920x817) with 1:1 pixel mapping on a digital projector?
Also, is it possible to use 1920x817p72 with HDMI 1.4a projectors?
post #2 of 7
Does it actually need to be a 1920x817 signal, or can it be a 1080p signal that is only rendering 1920x817? (letterboxed 1080p) The latter is easy to set up with an Nvidia card.
It's unlikely that you will be able to go over 60Hz with HDMI - most devices will only accept 24Hz, and then internally display a multiple of that. (e.g. 48/72/96/120/240Hz)
If you're lucky, and your display supports 50Hz, you might be able to get it to sync at 48Hz. So far, I have only been able to get my current display to sync down to 48.501Hz - any lower than that and it reports that the signal is unsupported.
post #3 of 7
Thread Starter 
Yes, I was thinking native 1920x817 signal. But use only part of the panel for 1:1 pixel mapping. Is that possible?
What is your method of letterboxed 1080p? Will that affect everything including Windows desktop?

Also, check this out http://www.csgnetwork.com/videosignalcalc.html
1920x817p72 actually takes less bandwidth than 1920x1080p60.
Edited by Elix - 5/1/13 at 4:34am
post #4 of 7
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This will send a standard 1080p signal to your projector, but applications (the desktop etc) will only render to a letterboxed 1920x817 portion of the display.
Quote:
Originally Posted by Elix View Post

Also, check this out http://www.csgnetwork.com/videosignalcalc.html
1920x817p72 actually takes less bandwidth than 1920x1080p60.
Bandwidth doesn't matter when it comes to digital displays - what matters is what the device will accept and sync to.

My TV accepts anything up to 1080p60 - but it will only accept 1080p24/50/60 (plus or minus 3% or so) rather than any value in the range of 24-60Hz.
I doubt you will find many devices that will sync to 72Hz properly, or accept anything that is not a standard HDMI resolution. (720p/1080p for HD signals)
Edited by Chronoptimist - 5/1/13 at 4:40am
post #5 of 7
Thread Starter 
Is this an nVidia tool or 3rd party tool? Isn't there a tool for ATI too?
I intend to dig further into this topic.
post #6 of 7
Quote:
Originally Posted by Elix View Post

Is this an nVidia tool or 3rd party tool? Isn't there a tool for ATI too?
I intend to dig further into this topic.
It's built into the Nvidia drivers. I have no idea about AMD.
post #7 of 7
Thread Starter 
http://www.wsgf.org/forums/viewtopic.php?f=72&t=18276
This guy was asking the same question and it seems he succeeded. It is still unclear whether he got 1:1 pixel mapping though. But he was aware of it in his 1st post.
And it still leaves the question will 3D be working on such resolution?
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