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Hi Luke, Why is the single frame orientated differently from the other
examples? In the third example I see the luminance sliders are all over the place. The upper slider of each pair should remain on zero. The lower slider of each pair should not end up far from the default settings. Only relatively minor adjustments should be needed. The top slider can be increased from it's default 80 to maybe 90 if you want to darken the background a little. The middle one can be moved a little from it's default
33 if you want to show a bit more or less nebulosity. The bottom one
can be reduced from it's default 50 if you want to quieten down the bright core of M 42 a bit. The straight diagonal line from bottom left to top right
should be a curve when the stacking is complete. The RGB dotted lines
should intersect with the aforementioned curve around a fifth to a quarter of the way up the histogram. Try that for a start.
raymo
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