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Thread: grey card a colored gels

  1. #1

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    Erik

    grey card a colored gels

    Hi All,

    Is there a difference of using a grey card under white light versus continuous light with a colored gel?
    Will the white balance still be corrected?

    Thanks,

    Erik

  2. #2

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    Urban Domeij

    Re: grey card a colored gels

    Not sure that I understand your question.

    If you use a colour gel on the light source, it may or may not be possible to white balance. It all depends on spectral distribution of the lamp and spectral absorption/transmission of the filter. Moreover, there are more than one possible way of white balancing, depending on light source, and there are also limits for the balancing itself, depending on the sensitivity of the light wells for different colours.

    So the answer is "maybe".

  3. #3

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    Erik

    Re: grey card a colored gels

    Hi,

    The gel is placed over the light source.
    I wonder if balance off the grey card I would cancel out the color from the gel?

    I look forward to an opportunity to try this.

  4. #4

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    Urban Domeij

    Re: grey card a colored gels

    The gel will be canceled out if it is rather light. If it causes uneven spectral distribution it cannot be canceled completely. Likewise if it is very saturated, so that it more or less blocks one or two of the primary colours, then it will not be canceled.

  5. #5
    William W's Avatar
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    William (call me Bill)

    Re: grey card a colored gels

    I assume you are using a Photographic Grey Card to make a Manual White Balance Reference Setting in a Digital Camera.
    I also assume the Gel on the Light is Colour Temperature Correction Gel.
    If these assumptions are correct, then the answers are:

    Quote Originally Posted by cichlid View Post
    Is there a difference of using a grey card under white light versus continuous light with a colored gel?
    Yes. But the difference is of no consequence to the Manual White Balance which is obtained.

    Hence -
    Quote Originally Posted by cichlid View Post
    Will the white balance still be corrected?
    Yes.

    If the assumptions are incorrect, then please restate the question.

    WW
    Last edited by William W; 24th April 2012 at 09:05 PM.

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