Hi,
I assume you are shooting using Auto White Balance (AWB) and sooting in jpeg file format.
The yellowish tint may be a result of your camera selecting the wrong white balance for color of ambient light in the room. Whether you shoot with fluorescent lights or tungsten lights, your white balance needs to be set correctly to compensate for the color of light. Tungsten light has a very warm yellow/orange tint to it - fluorescent has a green tint to it. In knowing this, your camera may make images with a green tint if you switch light types.
Things you can do to remedy the tint:
Try selecting the white balance for the type of light you are shooting in
Try using a Custom White Balance
Shoot in RAW format and fix the white balance later*
*This is one of the biggest advantages of shooting in the raw format, you can adjust white balance after the fact without degrading image quality.
In addition, you should research how to change white balance, setting custom white balance and jpeg versus raw file formats..