Exposure, while shooting a dark object against bright light.
Posted 14 November 2007 - 07:14 PM
Or another example - film strips on a lightbox. And I want the film strips to be black against bright lightbox. Same question.
Thanks a lot in advance!
Posted 14 November 2007 - 07:55 PM
To help out make sure the subjects to be silhouetted are as black and/or lo-con as you can get them then the rest of the scene can be exposed closer to normal (if that is helpful or not is up to you)
Depending on the lighting gear you have you can then spot meter the back light and control how far this will expose relative to the silhouette .
Some form of flagging/gobo work could help if there is other stuff in shot - but without knowing the full picture you expect its no use describing them yet
'Spot Meter' is the word of the day here
Posted 14 November 2007 - 08:33 PM
A close-up of a lightbox is a bit easier -- you just have to decide how many stops over medium gray you want the light panel to be, spot meter the white area, then open up by how many stops you want (three stops over would probably be "normal" bright but not burned-out, and five stops over would be pure white.)
When someone is near a window, I incident-meter what I think should be normally exposed -- for example, I can imagine someone next to the window being half-lit and meter that area, figuring that someone framed against the window will go silhouette. You could also figure that five-stops under on the shadow side should be black enough.