Cotty wrote:
On 16/2/09, Bruce Walker, discombobulated, unleashed:
As I'm encountering LED stage lighting more and more, and as my trusty
K100D Super doesn't include a WB setting for them, a question for the
physicists and lighting gurus on the list: what is considered to be the
colour temperature of typically available LEDs? Is there a recommended
near-enough equivalent setting among the WB choices?
When I run pix through ACR after the shoot, I find that I'm getting
more-or-less reasonable results with ACR's temp/tint sliders near their
extremes; eg 2000/-128 or else something like 11,500/-64.
(I'd love to sneek up onstage before the show and attach a grey card to
something so I could keep calibrating during the performance.
Sometimes I'm lucky and there's a greyish keyboard onstage I can refer to.)
I suppose that LEDs present an near-impossible task since they are made
up of clusters of green, red and blue LEDs whose brightness is varied to
get the desired colour. I expect that the colour-temp of each
colour-type of LED is different.
Anyway, anyone have a suggestion?
I assume you mean stage lighting of differing colours - perhaps
pulsating to music or changing mod settings. When filming a stage
setting, usually during a rehearsal in my case, if it's the former I
will use a preset 3200k setting (tungsten). If it's a scene that is
fairly steady yet with constant lighting, I will use a different preset
- either half-blue (about 4600k) or full blue (daylight, anywhere
between 5600k and 9000k usually). I can see the result instantly on a
small colour monitor.
That said, I try not to destroy the concept on stage that is being
offered. For instance during a scene in a cave, the light was very blue
- but to take a white balance under those conditions produced a very
neutral scene on the video and completely lost the mood. I pulled it
back a lot and split the difference, keeping the cold blue creepy feeling.
Of course, for stills this may apply differently. If it was me I would
shoot RAW and adjust in post processing, trying to keep it faithful to
the mood.....
HTH
Mr Cotty is absolutely correct. Shoot RAW, correct as little as possible
in post (just pull up the shadows, and maybe do a bit of highlight
recovery). Atmosphere is everything.
D
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