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Thread: Double Chroma Key -Editing both Green & Blue Screen at same time

  1. #1

    Default Double Chroma Key -Editing both Green & Blue Screen at same time

    I have a dilemma. I have footage that has both green & blue screen elements. I want to have different images showing behind each colour. Im not sure of the best way to do this?


    One way I thought I could do it -If I separately key out the Blue, revealing the image behind the blue and render that -THEN import this new clip and key out the green to reveal the image behind the green. This seemed like a good idea, until the green chroma keying also removed parts of the image that were added behind the blue screen. This also wouldnt be solved by changing the order either -keying green then blue.


    Surely there is a way this could be done? Any help appreciated.
    Thanks, Shawn

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    Could you explain in ore detail exactlyu what you ahev and what you are trying to achieve.
    Do you have an image which has both green and blue which need to be removed or do you have a series of images, some of which have green and some of which have blue?
    If the former, how on earth did you achieve that?
    Tim

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    What software?

    Using Vegas Pro it would depend on where you place the chroma key effect. If placed on the whole project it would affect all the material. Placing it on clips or on tracks should work.

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    Can you also elaborate on how you ended up with footage shot with 2 separate key bg colors in the same frame?

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    Ah, it's in one frame. In Vegas Pro I might use the cookie cutter effect to limit the chroma key effect to one area. But it would help to have a visual example of what the frame looks like.

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    Quote Originally Posted by bouldersoundguy View Post
    Ah, it's in one frame..
    I'm not sure we know that as the OP hasn't got back to us. But a visual example would be a definite help. Also a clue as to what software he has available.
    Tim

  7. #7

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    Ok, I have figured out how to do this from trial and error. (I am using Vegas Pro).

    1. chroma key out the blue in clip, revealing the desired background behind it, select "Cut" composite mode.
    2 Render as 3mps Quicktime, prog scan, PNG format, 32bpp color.
    3 Import this file back into project. Select properties, Media, Alpha Channel, premultiplied (or Straight).
    4 ensure blue chroma key is now off & composite set to source alpha
    5 Have the clip to be green chroma keyed beneath this imported clip & the green's desired background beneath that.
    6 Wollah! The blue & green areas of the original clip now have their own seperate image showing.

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    Glad you got it sorted.
    Stlill interested in how you came to be insuch a position though!
    Tim

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