Latest post Tue, Jul 13 2010 6:08 PM by Dan E.. 4 replies.
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  • Tue, Jul 13 2010 1:40 AM

    • Dan E.
    • Not Ranked
    • Joined on Tue, Mar 6 2007
    • Clearwater, FL
    • Posts 4
    • Points 55

    Hello all,

    I have been working with the SpectraMatte effect in Media Composer (version 3.1.3) for a project and have not been getting good results.  I am thinking it might be due to poor lighting on the blue screen, but I've seen worse lighting key well.  Also, our talent did show up with a light blue shirt (thank you producer) but it is nowhere near the color of our background.

    I am attaching 3 video clips below hoping someone might see something they've successfully adjusted before.  One clip is our talent with the SpectraMatte effect applied, another is just the talent in front of the blue screen and the other is a recording of the SpectraMatte display from the effects window with the effect enabled.  As these examples illustrate I am not getting a clean key.  Look closely at the SpectraMatte Display video and note the presence of a grid or checkerboard pattern in both the output video and the SpectraMatte display.  Also, the SpectraMatte display appears to have a well defined crosshair image in the center as well.  It almost looks like a starburst at times.  In the output video you can see vertcal lines around the talent's head.  It is difficult to see in the encoded video, but these lines are in even intervals like a grid and they appear to angle down on screen left and up on screen right.

     I am fairly new to the advanced features of Media Composer (recently upgraded from Xpress Pro) and it is possible I have some settings that are not quite right.  But I did follow Avid’s SpectraMatte tutorial and tweaked the obvious settings.  Has anyone seen the SpectraMatte effect present in this way and are there any suggestions for a remedy?  Again, it could be as simple as lighting or using a green screen instead of blue (Ultimatte in our live video switcher “likes” the blue screen better than the green).

    Thanks

    Avid Media Composer ver. 3.1.3 Mojo SDI I/O with Sony DSR-2000 DVCAM deck HP xw8200 Dual Xeon 3.40GHz 4G RAM Windows XP Pro Version 2002 SP 2 NVIDIA... [view my complete system specs]

    Dan, Clearwater, FL

    ---------------

    Avid Media Composer ver. 3.1.3
    Mojo SDI I/O with Sony DSR-2000 DVCAM deck.
    HP xw8200
    Dual Xeon 3.40GHz
    4G RAM
    NVIDIA Quadro FX 1400

  • Tue, Jul 13 2010 8:09 AM In reply to

    • lunalobo75
    • Top 500 Contributor
    • Joined on Thu, Oct 13 2005
    • Los Angeles, CA
    • Posts 278
    • Points 3,250

    Re: SpectraMatte Help

    Hey,

     

    If you have Boris CC installed (shoud have come with your MC package) then I would use Chroma key and combine different matte chokers and a light wrap (All Boris plugins) to get a WAAAAAY better result. I've never had much luck with spectramatte.

     

    This link here will get you started with Boris Chroma Key tips:

    http://community.avid.com/forums/p/60769/341569.aspx#341569

     

    he has a nice sample too!

     

    Salud!

     

    HP Z800 MC 8.3, Adobe CC, Windows 7 Ultimate 64-bit SP1, 2 Hex Core X5650 @ 2.67GHz, 48Gigs Ram, NVidia Quadro K4000, Sandisk Extreme 240 gig SSD System... [view my complete system specs]
  • Tue, Jul 13 2010 2:19 PM In reply to

    • Dan E.
    • Not Ranked
    • Joined on Tue, Mar 6 2007
    • Clearwater, FL
    • Posts 4
    • Points 55

    Re: SpectraMatte Help

    Thanks,

    I'm skeptical I will be able to do this correctly, it seems quite complicated.  I did find what appears to be a related tutorial on this procedure from John Lafauce and I thought I'd post it here in case someone stumbles on this thread with the same issue.  It is an excellent view...but still complicated.

    Thanks again.

     

    http://community.avid.com/forums/p/72793/407322.aspx

    Avid Media Composer ver. 3.1.3 Mojo SDI I/O with Sony DSR-2000 DVCAM deck HP xw8200 Dual Xeon 3.40GHz 4G RAM Windows XP Pro Version 2002 SP 2 NVIDIA... [view my complete system specs]

    Dan, Clearwater, FL

    ---------------

    Avid Media Composer ver. 3.1.3
    Mojo SDI I/O with Sony DSR-2000 DVCAM deck.
    HP xw8200
    Dual Xeon 3.40GHz
    4G RAM
    NVIDIA Quadro FX 1400

  • Tue, Jul 13 2010 3:44 PM In reply to

    • RUD ONE
    • Top 500 Contributor
    • Joined on Thu, Dec 14 2006
    • Milwaukee, WI
    • Posts 216
    • Points 2,570

    Re: SpectraMatte Help

    Is this footage DV? The results you are describing are very similar to trying to pull a good key from DV Footage. Do you have the facilities to digitize the footage in a higher resolution?

    MCA v4.0.5,HP XW8200, Adrenaline [view my complete system specs]

    Rud One - Milwaukee, WI

  • Tue, Jul 13 2010 6:08 PM In reply to

    • Dan E.
    • Not Ranked
    • Joined on Tue, Mar 6 2007
    • Clearwater, FL
    • Posts 4
    • Points 55

    Re: SpectraMatte Help

    Yep, you got it, DV.  My only option to acquire the video is DVCAM.  However, I must say that I gave the BCC Chroma Key tutorial a whirl and I am pretty impressed with the result.  This example is my first time working with the BCC Chroma Key and BBC Filter effects.  I still think I can get a better result with improved lighting on our CK screen.  I swear our blue looks darker than others I've seen.

     

    Avid Media Composer ver. 3.1.3 Mojo SDI I/O with Sony DSR-2000 DVCAM deck HP xw8200 Dual Xeon 3.40GHz 4G RAM Windows XP Pro Version 2002 SP 2 NVIDIA... [view my complete system specs]

    Dan, Clearwater, FL

    ---------------

    Avid Media Composer ver. 3.1.3
    Mojo SDI I/O with Sony DSR-2000 DVCAM deck.
    HP xw8200
    Dual Xeon 3.40GHz
    4G RAM
    NVIDIA Quadro FX 1400

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