|
|
Posted by Steve King on 02/11/06 15:57
"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.
Years ago I had a similar shoot. I substituted a piece of grey counter
laminate for the white board.
Steve King
Navigation:
[Reply to this message]
|