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Posted by Steve Guidry on 02/13/06 21:34
Forget trying to make it match. While it can be done, I think it's
probably beyond your skills and equipment set, given the fact that you're
asking about it here. A cursory review of the suggestions offered thus far
makes me believe that any/all of them will leave you wanting. Basically, to
do it right requires a set of flags and 4 or 5 lights, and the skills to
place and crop them correctly.
My advice : Just let the white blaze and clip.
The use CG to superimpose whatever the presenter is writing on the board.
Then use the sloppy results to lobby for the funds to take Holshevnikov's
lighting course.
Steve Guidry
"Richard Crowley" <rcrowley@xpr7t.net> wrote in message
news:11uroesjmtev3de@corp.supernews.com...
> "Craig Busch" wrote ...
> > Sorry about not giving enough information.
> > The situation is that the white board is reflecting a lot of light.
> > I would like to try to use the built in flourescent lights.
> > Any taping would be during the day and there are windows on
> > the wall opposite the whiteboard.
> > Shooting with miniDV. The camera has manual controls.
> > Between the built in lights and any light coming in, there is
> > plenty of light in the room.
> > The main objective is to tape a presentation which would
> > include the presenter speaking, but also writing things on the
> > white board, most likely with a black marker.
> > The main concern is the reflectioin coming off of the white
> > board which is an integral part of the presentation.
> > Thank you for sharing your knowledge and experience
>
> Ideally, you would light the whiteboard and the presenter
> separately. But since that is likely outside the realm of
> possibility, you will have to make a compromise between
> exposing for the whiteboard and exposing for the human.
>
> If the material on the whiteboard is more important (or if
> you have a shot of what is being written), you will need to
> close the iris down to expose that properly.
>
> Conversely, if seeing the presenter is more important, then
> you will likely need to let the whiteboard "clip" (go way
> overexposed to the point where you can't read the writing).
>
> I have found two things that are crucial to remember when
> doing this kind of video....
>
> 1) Unless you can have an extreme control over the lighting,
> you must choose between exposing for the presenter vs. for
> the whiteboard. You will likely never be able to get a good
> exposure for both at the same time.
>
> This may mean that you must manually adjust the exposure
> between the two very different subjects in real time, while
> also keeping track of the framing and focus. Or it may mean
> that you have separate cameras: one following the writing
> on the whiteboard and another one folowing the presenter.
> (And either live-switch them, or edit them together in post-
> production). This is the cost of not having the proper lighting.
>
> 2) Video does not have high enough resolution to get a wide
> shot of the whiteboard and expect the video viewer to be
> able to actually read what is written. You must actively
> zoom in on the area of the board where the presenter is
> writing at the moment. This is the cost of having a much
> large area of detail than can be contained in the limited
> resolution of NTSC (or PAL).
>
> You didn't mention audio, but IME, the only decent way to
> mic this scenario is to clip a microphone onto the presenter,
> whether wired or wireless according to your resources.
> Any other method of capturing the presentation is significantly
> sub-standard in quality.
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