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Digital color balance and SCUBA diving



 
 
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  #1  
Old March 23rd 05, 05:12 PM
Gerald
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Default Digital color balance and SCUBA diving

Should following a normal "custom" white balance process while at depth
result in accurate color capture? Any special considerations?


  #2  
Old March 23rd 05, 05:56 PM
Rudy Benner
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"Gerald" wrote in message
...
Should following a normal "custom" white balance process while at depth
result in accurate color capture? Any special considerations?


Adobe Photoshop will do a fairly good job of restoring what looks like
'normal' colour balance, its an approximation at best. You can make a grey
card for underwater use, this will improve the situation a bit. A strobe is
good for close work.

Email me offline for a sample of what Photoshop can do.


  #3  
Old March 23rd 05, 06:34 PM
Dr. Joel M. Hoffman
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Should following a normal "custom" white balance process while at depth
result in accurate color capture? Any special considerations?


Actually, white-balance adjustments are designed specifically not to
give you accurate color capture, but rather to make the photo look
most like what the eye sees.

The eye (along with the mind) automatically converts most off-white
ambient light to white, so even in a large range of settings, white
looks white.

Film and digital sensors don't do this conversion automatically, so
they have to be set according to the lighting. Normally, this is a
good thing, but in caes of extreme lighting (sunsets, under water) you
don't want the lighting to look the same as it would it ordinary
daylight.


I would recommend shooting in RAW mode (if you can) and adjsuting
things later. Or if you cannot, shoow in a variety of WB settings.

-Joel

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  #4  
Old March 23rd 05, 11:10 PM
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Dr. Joel M. Hoffman wrote:
: I would recommend shooting in RAW mode (if you can) and adjsuting
: things later. Or if you cannot, shoow in a variety of WB settings.

... and still take a shot of a white/grey card to aid in the RAW conversion
later.

-Cory

************************************************** ***********************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

  #5  
Old March 23rd 05, 11:10 PM
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Dr. Joel M. Hoffman wrote:
: I would recommend shooting in RAW mode (if you can) and adjsuting
: things later. Or if you cannot, shoow in a variety of WB settings.

... and still take a shot of a white/grey card to aid in the RAW conversion
later.

-Cory

************************************************** ***********************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

  #6  
Old March 24th 05, 02:32 AM
bmoag
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My recent experience in Hawaii:
Even in depths of just 10meters red light is fairly well filtered out by the
water as far as digital cameras are concerned. Using flash underwater is
often a problem as waterborne particles reflect the light back at the
camera. Post exposure color correction helps but the color effect is rather
unrealistic but better than nothing.


 




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