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Re: [OM] A trying test: One failure One passed

Subject: Re: [OM] A trying test: One failure One passed
From: Tom@xxxxxxxxxxxxx
Date: Fri, 14 Dec 2001 20:28:47 -0500
On Friday, December 14, 2001 at 19:17, John A. Lind 
<olympus@xxxxxxxxxxxxxxx>
wrote re "Re: [OM] A trying test: One failure" saying:
...
> Color balancing fluorescent light is much more difficult than incandescent
> (tungsten) because it isn't just a "roll-off" in a region of the visible
> spectrum.  Fluorescent and most other gas discharge type lighting (mercury
> vapor, sodium vapor, etc.) have significant spikes of specific wavelengths.
> 
> Worse yet is mixed lighting that has lighting sources of different 
> types.  Color balancing those situations can be nightmarish, often 
> impossible.  Look at what you shot to see if there's a possiblity of mixed
> lighting in them (daylight coming through windows, stage with tungsten based
> lighting, etc.).

Thats why movie makers have huge rolls of filters they put over windows, 
etc., to balance the colour temperature. Useful for photographers, too, but 
pricey & needs deployment.

Tom

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