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Author Topic: Pixinsight HaRGB  (Read 1622 times)

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Offline Roger B

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Pixinsight HaRGB
« on: 14:10:14, 28 October, 2014 »
Is there a right n wrong way to combine these ?   If so I'm doing it wrong as the resulting image doesn't look like a Ha RGB image not a lot different to the combined RGB.  Reading articles from Harry page & some on pixinsight they seem to refer to the bandwidth of the RGB filters.  I have looked on my Baader boxes & I cannot see them.   I have tried the HaRGB script in PI but get gradients on the right hand side of the resulting Hargb & as said there doesn't seem to be much difference combining the Ha.   

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Offline chris.bailey

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Re: Pixinsight HaRGB
« Reply #1 on: 15:00:11, 28 October, 2014 »

No right and wrong way as far as I can see.

Unless there are data elements that appear strongly only in Ha then you dont get a lot out of it TBH. If Ha is dominant you end up with Red and Black rather than Black and White for a mono Ha. Rosette works quite well with HaRGB using the script but lots dont. I also find adding lots of Ha into galaxies leads to something that looks very un-natural.

If the combination script doesnt do much I do one of two things (or even a mix of the two) -

1. Use the Ha as a pure Luminance and do an HaRGB. The longer Ha subs tend to be deeper than the RGB so can give the impression of a deeper image when combined.

2. Use pixel math to blend some Ha into the Red channel to taste (~30%). Doing this on its own does seem a waste of all that Ha data.

Personally, I do think Ha images stand up in their own right, who need colour :-)

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