Latest post Wed, May 21 2008 6:45 PM by TCurren. 14 replies.
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  • Tue, May 20 2008 6:55 PM

    contrast just the luminance channel

    we currently have avid adrenaline in house but i can't stand how there is no way of contrasting without increasing the saturation.  on a smoke you can just increase the black or white level without messing up the chrominance.  same with shake - there's a contrast luminance node.

     

    is this possible within symphony?  just contrast luminance without touching the chrominance? similar to a bleach bypass.

     

    thanks!

     

    ian.

  • Tue, May 20 2008 7:05 PM In reply to

    Re: contrast just the luminance channel

    AFAIK, you could only compensate for the extra chroma by desaturating.

    Symphony Nitris 3.0 on 2xquad core XW8400/4(??)GB | MC 3.0 on dual core XW8400/3GB | Mojo SDI | Unity Lanshare 4.23 fibre | MC 3.0 on MacBook 2.16/2.5GB... [view my complete system specs]
  • Tue, May 20 2008 7:16 PM In reply to

    Re: contrast just the luminance channel

    that never gives the same values though.  ends up looking terrible.

     

    :(

     

     

  • Tue, May 20 2008 7:22 PM In reply to

    • BLKDOG
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    Re: contrast just the luminance channel

    ...and Manipulating just  the top and bottom ends of the luma curve still gives you too much chroma change?

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  • Tue, May 20 2008 7:37 PM In reply to

    Re: contrast just the luminance channel

    i don't currently own a symphony so i'm not sure if the levels can just isolate the luminance channel.  

    if you crank the contrast on levels does it become more saturated?  

    thanks a ton,

    ian.

  • Tue, May 20 2008 7:40 PM In reply to

    • BLKDOG
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    Re: contrast just the luminance channel

    No Ian, on your Adrenaline, if you go to the CC tool and select the curves tool, you can manipulate just the top and bottom of the luminance curve. I was wondering if this would get you closer to what you want.

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  • Tue, May 20 2008 8:02 PM In reply to

    Re: contrast just the luminance channel

    this is a sample of contrast and contrast luminance.  

     http://sequence.tc/avid/lumcont.jpg

     

    contrast luminance

  • Tue, May 20 2008 8:09 PM In reply to

    • BLKDOG
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    Re: contrast just the luminance channel

    Yeah, I know the difference, What I'm asking you is can you do the same thing with just the luma curve in the curves tool?

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  • Tue, May 20 2008 8:16 PM In reply to

    Re: contrast just the luminance channel

    no.  not on media composer. that's why i'm wondering if the symphony lets you isolate just the luminance within the levels.

    thanks,

    ian.

  • Tue, May 20 2008 8:24 PM In reply to

    Re: contrast just the luminance channel

     Yes, on Symphony you can use the levels controls and isolate luma to get the look you're going for.

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  • Tue, May 20 2008 8:26 PM In reply to

    • BLKDOG
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    Re: contrast just the luminance channel

    I don't think so. Pretty much everything I've tried affects chroma too.

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  • Tue, May 20 2008 8:35 PM In reply to

    • BLKDOG
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    Re: contrast just the luminance channel

    I'm doing that now Steve but the levels are still changing  the chroma.

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  • Wed, May 21 2008 5:04 PM In reply to

    • BLKDOG
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    Re: contrast just the luminance channel

    Ah...I missed the tab to isolate just the luminance.

    I found  that today and yes, you can do just as Steve suggests.

     

    Symphony Nitris DX Mac Pro Dual 3.0 4 gigs of Ram [view my complete system specs]

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  • Wed, May 21 2008 5:35 PM In reply to

    Re: contrast just the luminance channel

    Thanks BlackDog for clearing that up.  I figured if you said it can't be done, I must be crazy. 

    Avid Symphony Nitris v1.7 on HP xw8200 3.4GHz with 2.75Gb RAM Avid MC AdrenalineHD v2.7 Avid MC soft v2.7 with Mojo SDI Avid Xpress meridien v4... [view my complete system specs]
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  • Wed, May 21 2008 6:45 PM In reply to

    • TCurren
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    Re: contrast just the luminance channel

    Steve Pomerantz:

    Thanks BlackDog for clearing that up.  I figured if you said it can't be done, I must be crazy. 

    I had to go double check as I know I had used that tab before without it affecting chroma.
    Terence Curren Alpha Dogs, Inc. Burbank, Ca www.alphadogs.tv
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