Luka,
1. After you load the image, in menu select "Digital Photo" -> "RGB Balance"
2. Try coefficients 1.93 1.00 1.80 (I've seen these quoted for D70)
3. Select (using the mouse) some sky background relatively devoid of stars/nebula and type the command 'black'. This neutralises the sky background colour.
Hope that helps.
Terry
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