Light-balancing filters let you make minor adjustments in the color quality of illumination. The color balance jargon includes cooler (bluer) or warmer (yellower). The jargon also refers to color temerature, and to get accurate conversions, you must already know the color temperature of the prevailing light (using, of course, a color-temperature meter[
]); many filter manufacturers offer detailed charts on how to convert a particular "color temperature" to another color temperature.
But don't despair, effectively, you can make a photo less yellow by guessing (I prefer the term approximating[8D]). Essentially, use a blue filter to make the photo less "warm", and a yellow filter to make the photo more "warm". The photo I saw of yours looks warm (and quite nice, BTW)
You don't need to put the filter on the lens, either - with your camera (Kodak DC215), you'd need a separate system, probably by Cokin, to attach filters to the lens, and that's not cheap. I'd try getting a 'gel' to cover the light source. These can be obtained at many professional lighting supply houses - you can try local music stores that sell lights for bands. Get a gel that is very light blue, and perhaps another that is a little darker blue (but still light), and put it in front of the light when you are taking pictures. Keep in mind that the 'gel' is designed for very high-intensity lights, and you are probably using much lower power illumination - that's why I suggest the very light blue.
You may also be able to find something around the house to tint the light. Also, an uncoated (bare glass) incandescent bulb might help too. Or one of the department stores might have a blue-tinted bulb...
This should give you a chance at reducing the 'warmth' of the pic for not too much money. And you can use the gels to give mood lighting in your house afterwards...[}
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