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Thread: Chroma Key transparency

  1. Default Chroma Key transparency

    Well, I have some time on my hands so I thought I'd 'play' with the chroma key FX in Vegas Pro 9e - just for fun (like you do). However, I am rather disappointed by the fact that I can see the background through my foreground image (me!)

    I have a well lit shot of me against a good flat green cloth (came with Pinnacle Studio) and I have tried a number of different video backgrounds including a rather darkened interior of a church. I can understand that perhaps the windows may show through but it's things like straight lines i.e. the back of the rows of pews that come through too.

    I've tried fiddling about with the threshold but 0.00 was the strongest image of me, I used the preset 'green background, which gave better results than using the eyedropper. I assume I am correct in putting the foreground above the background on the timeline.

    Any hints?
    __________________________________

    Castman
    Uses:
    Canon XH-G1
    Sony Vegas Pro 9e
    gallons of coffee

  2. Default

    Just in case you're not doing it right:
    Set chromakeyer preset to Green Screen & turn off (untick box).
    Make sure low threshold set to 0.
    And high threshold set to 1.
    With eyedropper get most uniform sample of green from greenscreen.
    Tick Show mask only box
    Turn Chromakeyer on ( tick box)
    Reduce high Threshold till you (the image) are all white
    Increase low threshold till background all black
    Use a little blur to soften the edges.
    Untick Show mask only box.
    Place your background underneath.

    I hope you're not wearing green?

    Sarah
    Last edited by Sarah & Allison; 05-31-2010 at 11:40 PM.

  3. Default

    Yep that is what I am doing, I also used the preset without the eye-dropper and got the best picture sliding the green-magenta slider back and forth a few times, but still there is a degree of transparency. It must be just some quirky oddity of the scene selected as I tried it again with a different background video and it was a lot better
    __________________________________

    Castman
    Uses:
    Canon XH-G1
    Sony Vegas Pro 9e
    gallons of coffee

  4. #4

    Default

    I know this is unlikely but have you reduced the opacity of the clip with the slider or something like that. It just seems peculiar that you can see through the top tack.

  5. Default

    No, the main clip is at full opacity. Having 'played' with it more, I don't think the 'main' clip (i.e. me to camera) is the problem as I have managed to produce good results from repeating the process using different background clips. I just find it rather weird that the darkened interior of a church presents such problems, I used the clip thinking it would be an ideal clip for this experiment....maybe it's a ghost
    __________________________________

    Castman
    Uses:
    Canon XH-G1
    Sony Vegas Pro 9e
    gallons of coffee

  6. Default

    Is the Compositing Mode of the image track set to Source Alpha?

    The only other thing I can think of (& from what you say it probably wont help in your case) is using the Mask tool in Event Pan/Crop to mask out any unwanted artefacts.


    Sarah

  7. Default

    Sarah, I am at a loss to know what the problem is. I think I shall just have to write this off as a complete mystery
    __________________________________

    Castman
    Uses:
    Canon XH-G1
    Sony Vegas Pro 9e
    gallons of coffee

  8. #8
    Join Date
    Jun 2010
    Location
    Central NJ
    Posts
    5

    Default

    You might want to think about sharing some pertinent screencaps? That might enable someone to spot something you've missed?

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