Tom Lammert |
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ISO and Color Temp
Using my Canon EOS 20D indoors in low light I raised ISO to 1600 in order to take pictures of my daughter at a shutter speed of 30. I noticed when reviewing the pictures in RAW that to get the best coor I had to shift the color temp all the way to 2800. I suspect that the appropriate color temp was even less. Does using a higher ISO affect color temp and if so how?
December 28, 2005
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Jon Close |
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No, ISO does not affect the color temperature. Color temp is based on the lighting source only. 2800K is about right for typical tungsten filament light bulbs.
December 28, 2005
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Tom Lammert |
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Jon, Thank you for the prompt response. Is there a means, other than using flash or other lighting to compensate for lighting that may be below the lowest color temp setting on the camera?
December 28, 2005
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robert G. Fately |
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Tom, I don't know that you'll come across a light source with a color temperature loser than 2800K. Understand that the whole color temperature thing relates to physics; it's the expected type of light that would be emitted by a so-called perfect black body at that number of degrees kelvin (Kelvin is like Celcius but 0 degrees K is absolute zero - about -273 degrees C). Tungsten lighting is very reddish - 3400K is a common light temperature for normal or tungsten halogen type bulbs. As the temperature gets higher, the coor becomes bluer - so noon on a clear day is about 5000K or maybe even 6500K. As you reduce the temperature, though, the color becomes redder - to the point of infrared - thus invisible anyway. So, unless you want to take IR photos (which some digicams apparently can do) there is no point in compensating for a color temp below 2800 - by then it's IR shooting anyway.
December 28, 2005
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Tom Lammert |
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Thanks Bob. I might load some images to better explain the color shift that I am getting by lowering the color temperature of the RAW images.
December 29, 2005
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