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Sorry my friend, I am only up to taking darks, flats I will try next...
I am just speculating here but, I would imagine flats work on a similar principal to darks. You are trying to eliminate the defects in the light. The bluish tinge is probably a defect that will be subtracted, or do you add flats...??? Don't know sorry...
The only other suggestion would be, try changing the light setting in the camera... I get bluish images when I have my compact set to.... one of the settings, try them all.
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