I think that your camera may be set to automatically correct for color temperature. It's reading the beige towel as white, and setting things that way.
Look for a feature like "automatic white balance" and turn it off, instead selecting "sunlight" "outdoors" or something that will balance for 5200K.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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