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Thread: Cleaning up noise in Canon XH A1 (or in general)

  1. #1

    Unhappy Cleaning up noise in Canon XH A1 (or in general)

    Hi,
    I've got XH A1 just recently and was trying to do a bit of greenscreen in 1080p.
    I've shot some footage and captured it into Vegas but the problem is that the quality is not quite as good as I'd expect and there is so much noise as you can see even in the still pic that I've included - especially the black areas.
    This is a huge problem for me because if I want to increase the brightness on the talent the noise is even more visible.
    I've seen people making a great greenscreen footage with cameras on this level but I just can't get there.
    Any tips on how to improve the footage or should I have my cam serviced?


  2. #2
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    The green background is too overexposed.

    Get the lighting and exposure right and the rest will be easy.
    Last edited by Rembrandt Rob; 03-23-2010 at 02:03 PM.

  3. #3
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    I wouldn't say it over exposed and neither does the histogram in photoshop. Is the gain turned on?

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    Quote Originally Posted by smifis View Post
    I wouldn't say it over exposed
    That's because you don't know what you're talking about Smifis.

    In an ideal world your green-screen would have colour attributes of:
    Red 0%
    Blue 0%
    Green 100%

    or, in photoshop terms.

    Red 0
    Blue 0
    Green 255

    Although most compositors would say that, for the best chance of a clean key, the green level should be at about 80% or 200 units if the foreground is correctly exposed.

    Whereas the O.P. actually has:

    Red 129
    Blue 87
    Green 220

    Edit:
    This following example is the absolute maximum luminance level the background should have. It's a framegrab from a cheapo secondhand mini-dv palmcorder so, as this gives a clean key, your XH-A1 should cream it once you get the exposure right.


    Video Editing Forums: Digital Director
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    Last edited by Rembrandt Rob; 03-27-2010 at 11:39 AM.

  5. #5

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    Quote Originally Posted by smifis View Post
    I wouldn't say it over exposed and neither does the histogram in photoshop. Is the gain turned on?
    This one sounds right, you may have auto gain on. I use a Canon for green screening and had some problems with noise. It turned out that auto-gain was on.

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