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By warmer, they mean that the color leans toward yellow and orange. Daylight film (or a digital camera set to daylight) are balanced so that light such as you see outdoors or through a window will appear natural or white. This is the wonderful thing about digital: between frames, you can switch the color balance to incandescent (tungsten) so an image taken near an incandescent lamp will appear less yellow. If you shoot raw, then the color balance is not affected until later in your editor.

To demonstrate this, you can take a picture of a person with one side facing a window and the other side facing a table lamp (with a regular bulb - not fluorescent). Shoot one picture with the camera set to daylight and one picture with the camera set to incandescent/tungsten. Then compare. You can take the same shots and play with the color balance in program like Photoshop. There are good examples in books and magazines, but it's good to do it yourself so you know your camera settings.

Watch out for fluorescent bulbs and the kind of lights like you see in gymnasiums. To the human eye, they appear fairly white, but they are changing color and brightness (flickering) at 60 times a second. So you want a shutter speed that is 1/60 or longer to avoid problems. Even then, they aren't really quite white. Most digital cameras have a fluorescent setting to take care of the difference. Some films handle this better than others.

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Why does an incandescent light bulb produce a continuous spectrum that seems to favor red?

Actually the peak of the radiation from an incandescent light bulb is in the near infrared, not the visible spectrum. The visible light that you see is the falling upper sideband of this: very strong in the red and declining until it is weak in the blue and violet end with a very small amount of radiation in the ultraviolet. The lower sideband extends across the infrared and into the far infrared. Well under a third of the emitted electromagnetic radiation of an incandescent light bulb is visible light, most is infrared.


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Why does the colors of an object look different under a fluorescent lamp from the way it looks under an incandescent lamp?

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