How to get the exact value of the camera's white balance parameters when it is in automatic mode?
There seems to be no way to do this.
You can find what you're looking for by browsing the Exif metadata for the final JPEG (after the image has been taken) to find the ColorSpace tag.
According to the color space specification, you can find out the light point of the light: http://en.wikipedia.org/wiki/RGB_color_space#Specifications
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