MadMapper Syphon Input colors inaccurate.
  • ProjectileObjects
    activ8 member
    Posts: 60
    Joined: Wed Sep 03, 2014 4:47 am

    MadMapper Syphon Input colors inaccurate.

    by ProjectileObjects » Sun Aug 04, 2019 5:30 am

    Hello, I'm trying to understand why Madmapper is showing a syphon input darker than the source. If you look at the photo example, the window is sending out a white area. Syphon Recorder shows a white area, but MadMapper shows the same source as grey.

    Does someone know why Madmapper's syphon is not pulling in the correct color values?

    Image
  • mad-matt
    garageCube team
    Posts: 1475
    Joined: Mon Sep 09, 2013 5:50 pm

    Re: MadMapper Syphon Input colors inaccurate.

    by mad-matt » Mon Aug 05, 2019 12:39 pm

    Hi,
    That's because of Alpha channel. MadMapper supports Alpha channel by default, if the source stream transmits an Alpha channel and the alpha channel is not fully opaque, that would be different in MadMapper than in Syphon Recorder.
    Please choose "Ignore Alpha" in the blending mode of the Quad, it should now show the same image than Syphon Recorder. Can you confirm this ?
    Cheers
  • ProjectileObjects
    activ8 member
    Posts: 60
    Joined: Wed Sep 03, 2014 4:47 am

    Re: MadMapper Syphon Input colors inaccurate.

    by ProjectileObjects » Mon Aug 05, 2019 7:06 pm

    Hi,
    That's because of Alpha channel. MadMapper supports Alpha channel by default, if the source stream transmits an Alpha channel and the alpha channel is not fully opaque, that would be different in MadMapper than in Syphon Recorder.
    Please choose "Ignore Alpha" in the blending mode of the Quad, it should now show the same image than Syphon Recorder. Can you confirm this ?
    Cheers
    Yes, worked perfectly. Thank you.
  • dfreeds1
    junior Member
    Posts: 2
    Joined: Mon Nov 19, 2018 7:02 pm

    Re: MadMapper Syphon Input colors inaccurate.

    by dfreeds1 » Mon May 09, 2022 6:54 pm

    Having the same issue. Ignore alpha isn't fixing it when attempting to send my image to LED panels over ArtNet.
    Any leads appreciated.

    MadMapper 5.0.5, Windows, Incoming texture is coming from Max MSP over Spout.
  • mad-matt
    garageCube team
    Posts: 1475
    Joined: Mon Sep 09, 2013 5:50 pm

    Re: MadMapper Syphon Input colors inaccurate.

    by mad-matt » Tue May 10, 2022 10:42 am

    Having the same issue. Ignore alpha isn't fixing it when attempting to send my image to LED panels over ArtNet.
    Any leads appreciated.
    Ignore Alpha is fixing it for video surfaces, but there's no "ignore alpha" on fixture (you could do it by multiplying color levels by the invert of alpha in glsl expression but it's tricky)
    The solution for a video projector loopback to LEDs is to put a black "solid color" layer in the background of the video projector used for loopback. Then alpha will be 1 in the loopback visual.
  • dfreeds1
    junior Member
    Posts: 2
    Joined: Mon Nov 19, 2018 7:02 pm

    Re: MadMapper Syphon Input colors inaccurate.

    by dfreeds1 » Wed May 11, 2022 5:42 pm

    Thanks, this was exactly the info I needed!

    For any Maxers that may experience this:
    Andrew Benson's alphaglue fragment shader set to a -1. threshold on my outgoing texture did the trick.

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