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Great shot there, well composed too.
As I use Iris to process my images, after stacking etc, I fraw a small box over a dark area of sky witn no stars in the box, then use the "white" command, it neutralizes the sky background, in other words r g and b become equal. Then I stretch levels etc. As long as I first do this "white" command it makes colour balancing a lot easier. I leave the white balance as is (awb by default) as when I use Iris to debayer the images for initial dark subtraction etc, I dont think white balance is relevant as it uses the raw unprocessed image from the camera sensor to start with.
With my modded camera images shot thru the UHCS look pinkish unprocessed. However when debayered and processed, then "rebayered" in Iris they look greenish presumably as theers more green pixels then blue or red on the sensor and initially theres no white balancing
Scott
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