Any alternatives to Syphon Virtual Display? Or any way to edit resolution?

Discussion in 'macOS' started by sportsfanMAW, Feb 25, 2016.

  1. sportsfanMAW macrumors regular

    Joined:
    Dec 27, 2006
    #1
    Hi all,

    Currently I have three projectors hooked up to an iMac via TripleHead2Go to create a triple wide screen. I'm currently using Qlab to do edge blending for the projectors and I'm using Syphon to pump a feed from ProPresenter into Qlab (to apply edge blending) and then out to the projectors. This is working ok, however, I would like to have Keynote go through Qlab as well. My issue is when I pump keynote through Syphon Virtual Display it get's warped in the process. The virtual display is set at 1024x768 resolution it's outputting to a screen of 3072x768 (because of the TripleHead2Go). When I create a Keynote in a 3072x768 format and pipe it through Syphon it gets "squashed" so that it's stretched wide but small from top to bottom. When I keep the Keynote in a 1024x768 to match Syphon, it gets stretched when it's outputted to the projects.

    Does anyone know how to change the resolution on my virtual Syphon display to be 3072x768? Or are there any alternatives to Syphon that can give me a virtual display like Syphon does?

    Thanks!
     
  2. campyguy macrumors 68030

    Joined:
    Mar 21, 2014
    Location:
    Portland / Seattle
    #2
    We've bound two virtual displays together using SwitchResX, I don't see any reason why adding additional width would cause an issue. You didn't offer which OS you're using, SwitchResX does work well under 10.11 and I know that the Syphon dev team called it quits a couple of months ago. SwitchResX does have a demo at its site, we own multiple licenses as we're pretty happy with it, visualizing CAD animations and databases on our walls.

    Look into creating custom display sets and that should get you started... It's a pretty powerful utility IMHO.
     
  3. sportsfanMAW thread starter macrumors regular

    Joined:
    Dec 27, 2006
    #3
    Thanks! I'm running El Capitan on the computer I'm using. I keep trying to make a custom resolution of 3072x768 but SwitchResX keeps saying it's invalid. Any idea how to get that resolution to be accepted?
     
  4. campyguy macrumors 68030

    Joined:
    Mar 21, 2014
    Location:
    Portland / Seattle
    #4
    You're welcome. The "trick" we used on our InFocus IN5310HDa projector set up was to use a "multiplier" of the actual resolution (horizontal) that suits our needs, and making sure that the display ratio was appropriate (16:9). The layout we're displaying took a bit of math and playing with the frequencies to get it to work. It boiled down to 3820x1080, and we use 30Hz as we're only using static images in our presentations - no animations - although (I think) 50Hz is available to us. I like that InFocus unit because, if the eGPU goes wonky on us we still can use HDMI or DisplayPort or (of course) DVI-D for a direct connective option, as our clients just want it to work...

    I'd also recommend a restart after picking a suitable resolution for your setup, and checking SwitchResX's settings just to make sure that they've taken.
     

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