Post- processing: Use your photo editing software to adjust the levels of your lightning shots. Bring the black point in a little (marked in the blue square) to give your photos more contrast and darken any foreground elements. Resist the temptation to brighten your photos, as this will make the bolts look thicker and can also introduce more noticeable purple fringing. Sharpening should also be overlooked as it can cause bolts to lose their smoothness and introduce noise. If your shots have a colour cast, try removing it by setting the white point on the lightning bolt itself.