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07/22/2004 04:27:52 AM · #1 |
Does anyone know of any references that detail the exact colors shifts of each temperature of light?
What I am wanting to do is to create a scale of colors, along with the cooresponding Kelvin temperature. the idea is to be able to display/hold the scale in any light and be able to look to see what temperature is the whitest.
So, any references to such a chart, or to the data needed to create it.
Thanks
David
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07/22/2004 02:00:21 PM · #2 |
i'm not sure but i think each camera's firmware has their own white-balance settings. so it may not be consistent across different camera manufacturers. i believe the daylight temperature is pretty standard, but the variations they come up with for programmed white balance modes like "shade" or "cloudy" might be different.
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07/22/2004 02:09:12 PM · #3 |
From: //www.schorsch.com/kbase/glossary/cct.html
Some typical color temperatures are:
1500 k Candlelight
2680 k 40 W incandescent lamp
3000 k 200 W incandescent lamp
3200 k Sunrise/sunset
3400 k Tungsten lamp
3400 k 1 hour from dusk/dawn
5000-4500 k Xenon lamp/light arc
5500 k Sunny daylight around noon
5500-5600 k Electronic photo flash
6500-7500 k Overcast sky
9000-12000 k Blue sky
/edit added URL
Message edited by author 2004-07-22 14:10:22.
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07/22/2004 02:35:28 PM · #4 |
Very similar to Photom's info, this is what is in the E-10 pdf, and I keep a printed copy in my camera bag:
1000K: Matches, candles, oil lamps - yellow orange flame
2000K: Very early sunrise, low effect tungsten lamps
2200-2500K: Household light bulbs
3000K: Shooting under incandescent lamps
3200-3400K: Studio lights, photo floods
3700K: Shooting under fluorescent lamps to preserve the mood of the lighting
4000K: Shooting under white fluorescent lighting
4500K: Shooting in daylight with white fluorescent lights
5000-5200K: Typical daylight, electronic flash
5500K: Shooting outdoors on a clear sunny day, to shoot in red or to shoot fireworks displays
6000K: Bright sunshine with clear sky
6500K: Shooting outdoors on a cloudy day
7000K: Slightly overcast sky
7500K: Shooting outdoors in the shadows on a clear day
8000K: Hazy sky
9000K: Open shade on a clear day
10,000K: Sunless blue skies
20,000K: Open shade at upper elevations on a very clear day
Message edited by author 2004-07-22 14:36:07.
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07/23/2004 02:52:57 AM · #5 |
Hmmm...
Thanks for the replies, but it seems I didn't make myself very clear.
I have not had any trouble finding a chart of the various temperatures of the common lighting conditions. But that is not what I am looking for here. What I am wanting is some method of finding the color of light at a certain temperature. Specifically, I want to be able to create a colored square on a piece of paper (or display it on my monitor screen) and have that square be white (when viewed, not photographed) in a specific light.
Do you know where I can find a chart of the color values (in any colorspace, I am not picky) of the color of light at a certain temperature? Even the formulas or such that derive the color would work, as I am not afraid of a bit of math. :D
David
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07/23/2004 08:24:05 AM · #6 |
Not sure if this is it but you might find it interesting:
//www.fourmilab.ch/documents/specrend/ |
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07/23/2004 10:21:17 AM · #7 |
I'm not sure that what you want is possible. A card that is true white reflects all colors equally (such cards are available from numerous sources). Cards that are slightly yellow or blue reflect slightly less of some colors to give them that tinge (these are available also and useful for digital photography; search the Internet for "white balance card"). But no matter what light source is used, the true white card will always appear whiter than the off-white ones; that's how the eye works.
To determine the color of a particular light source, you need a colorimeter or spectrophotometer. You didn't say why you want to do this; if it is to set the white balance for your camera, the easiest way is to use a white or gray card. |
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07/23/2004 01:44:27 PM · #8 |
xion: thanks, that certainly gives me some reading to do. Looks to be what I am looking for.
dr rick: You ar probably right, the subtractive nature of reflective light would make a printed card impossible -- but the additive nature of the projected light would still seem possible. The original thought was to create a chart that I could use to find the correct setting for my monitors temperature setting based on the ambient light in the room.
What I am thinking of would probably need to be a program, rather than a static chart, displaying a spectrum of color. This spectrum would be relative to a scale with 0 in the middle and +/- to the respective sides. This way it will be much easier to see just how much change in temperature is needed to move the perceived color (projected + ambient) to white.
I am thinking a gradient would make it easier to judge the correct temperature, since having the entire screen change makes it too easy for the eye to adjust and perceive an off-color as white.
David
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02/21/2005 02:25:34 PM · #9 |
I've been poking around at my D100 thinking about doing the manual white balance vs using the automatic (I've had to do this for decades on video cameras, but I've just been too lazy to do it on the digital still). My problem though has been that poking through the Nikon manual for the D100 I'm successfully confusing myself when I get out to actually shoot. Has anyone developed a nice simple process they could share as to what the steps are to set the manual white balance on the D100?
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