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Newbie Question About Color Balance Problem in D70s ?



 
 
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  #11  
Old January 25th 07, 07:43 AM posted to rec.photo.digital
Magnusfarce
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Posts: 15
Default Newbie Question About Color Balance Problem in D70s ?

I found a possible explanation for the color balance shift at Ken Rockwell's
website. In his article "How to Shoot Sports", he states that the rapid
flicker of flourescent or halide lights caused by their 60 hz power source
also causes flickering of color as well. Our eyes don't pick it up, but at
higher shutter speeds, the camera can and will sometimes produce white
balance changes from frame to frame. Any thoughts on this?

- Magnusfarce (OP)



"Magnusfarce" wrote in message
...
Thanks, I'll look into that. May have more questions as a result.

- Magnusfarce


"Ed Ruf (REPLY to E-MAIL IN SIG!)" wrote in
message ...
On Mon, 22 Jan 2007 20:26:16 -0800, in rec.photo.digital "Magnusfarce"
wrote:

OP here -

Thanks for the thoughts. I probably should have mentioned that one of
the
most obvious cases of this shift in color occurred in a pair of
consecutive
shots taken not more than maybe a second apart with the same background.
I'd be happy to e-mail them to one of you for inspection if you think it
would be helpful. Is it likely that this is a problem with the camera?
(BTW, I shoot in a somewhat compressed mode for things like this, as
opposed
to raw.)


Then I'd guess you where using spot or center-weighted metering.
--
Ed Ruf )
http://edwardgruf.com/Digital_Photog...ral/index.html





  #12  
Old January 25th 07, 07:52 AM posted to rec.photo.digital
acl
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Posts: 1,389
Default Newbie Question About Color Balance Problem in D70s ?



On Jan 25, 9:43 am, "Magnusfarce" wrote:
I found a possible explanation for the color balance shift at Ken Rockwell's
website. In his article "How to Shoot Sports", he states that the rapid
flicker of flourescent or halide lights caused by their 60 hz power source
also causes flickering of color as well. Our eyes don't pick it up, but at
higher shutter speeds, the camera can and will sometimes produce white
balance changes from frame to frame. Any thoughts on this?


Er... did you read the reply I wrote?

On second thought, I asked if it was fluorescent, but didn't say why.
And you didn't ask, so forgot to explain. Oops!

Anyway. Can you put a couple of the affected shots somewhere for us to
look at?

  #13  
Old January 25th 07, 07:15 PM posted to rec.photo.digital
RickR
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Posts: 2
Default Newbie Question About Color Balance Problem in D70s ?

Note from a lighting guy:
Every photographer should look up a light bulb maker (GE, Phillips,
Sylvania/Osram, etc.) and find the "spectral distribution" charts for
various light types. These are much like a histogram for a light bulb.
Only tungsten and daylight are smooth across the rainbow.

http://www.gelighting.com/na/busines...ion_curves.htm

You may not be able to judge the color without a comparison but if you
can identify the basic type of lights you'll know what your up against.
White balance just shifts the overall color perception and doesn't
account for the true nature of the source.

Richard Reid, LC
PS LEDs are comming...

On Jan 24, 10:45 am, acl wrote:
Magnusfarce wrote:
This took place in a large gymnasium-type building set up with decent
lighting, but honestly, I never thought to look up. (Guess I need to get
into the habit.)


If I can find out, I'll post. In situations wherel ighting can be properly
identified, can a filter be used to restore neutral white balance, or would
that be done better through the camera WB settings? Should I be able to
look at a ceilinglightand identify its type by color, either now or with
practice?I don't know if people can judgelightcolour accurately, I certainly

can't. You can white balance using a white/gray card (your camera has a
setting called custom WB or something like that), or by using predefined
settings.

Using a filter (instead of just WB in camera) will have the advantage of
reducing the imbalance in exposures between different channels [thus
noise in one of the channels], but the disadvantage of requiring higher
ISOs or exposure times (or faster apertures). If you don't understand
this paragraph, ask!



- Magnusfarce (OP)


"acl" wrote in message
roups.com...
Magnusfarce wrote:
Thanks, I'll look into that. May have more questions as a result.


- Magnusfarce
Changing metering pattern doesn't affect white balance, only exposure.


Were you shooting under fluorescentlights?- Hide quoted text -- Show quoted text -


  #14  
Old January 26th 07, 03:05 AM posted to rec.photo.digital
Magnusfarce
external usenet poster
 
Posts: 15
Default Newbie Question About Color Balance Problem in D70s ?

The best examples are shots of a player who is not my daughter and I'd
rather not post them to a public site. I'd be okay emailing them to one or
two people in the group who have responded. There's a great pair of shots
taken less than a second apart with essentially identical backgrounds and
very different color balances.

- Magnusfarce


"acl" wrote in message
oups.com...


On Jan 25, 9:43 am, "Magnusfarce" wrote:
I found a possible explanation for the color balance shift at Ken
Rockwell's
website. In his article "How to Shoot Sports", he states that the rapid
flicker of flourescent or halide lights caused by their 60 hz power
source
also causes flickering of color as well. Our eyes don't pick it up, but
at
higher shutter speeds, the camera can and will sometimes produce white
balance changes from frame to frame. Any thoughts on this?


Er... did you read the reply I wrote?

On second thought, I asked if it was fluorescent, but didn't say why.
And you didn't ask, so forgot to explain. Oops!

Anyway. Can you put a couple of the affected shots somewhere for us to
look at?



  #15  
Old January 26th 07, 09:24 PM posted to rec.photo.digital
acl
external usenet poster
 
Posts: 1,389
Default Newbie Question About Color Balance Problem in D70s ?

Magnusfarce wrote:
The best examples are shots of a player who is not my daughter and I'd
rather not post them to a public site. I'd be okay emailing them to one or
two people in the group who have responded. There's a great pair of shots
taken less than a second apart with essentially identical backgrounds and
very different color balances.

- Magnusfarce


"acl" wrote in message
oups.com...

On Jan 25, 9:43 am, "Magnusfarce" wrote:
I found a possible explanation for the color balance shift at Ken
Rockwell's
website. In his article "How to Shoot Sports", he states that the rapid
flicker of flourescent or halide lights caused by their 60 hz power
source
also causes flickering of color as well. Our eyes don't pick it up, but
at
higher shutter speeds, the camera can and will sometimes produce white
balance changes from frame to frame. Any thoughts on this?

Er... did you read the reply I wrote?

On second thought, I asked if it was fluorescent, but didn't say why.
And you didn't ask, so forgot to explain. Oops!

Anyway. Can you put a couple of the affected shots somewhere for us to
look at?




Well, you can post a crop not including the player, or you can try
emailing a couple to me (not that I am such an expert on this, but I can
offer an opinion if you want).
 




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