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#11
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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
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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
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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
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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
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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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