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  • Import tif, image->mode->16bit
  • Select target area, inverse, filter -> rc astro-> gradient -> middle + bottom
  • Magic wand, select everything; select ->load->subtract, filter -> rc astro-> gradient -> top + top
  • levels -> move black slider to just left of histogram start point, grey a bit left (120)
    • repeat as neccessary, watch for noise
  • Curves: use finger button to select medium point in sky, everything above that will be brightened
    • select another anchor point right above, 4 or so more, then adjust
  • Filter -> Noise and Sharpen