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I use the Pixinsight plugin Image Blend to integrate an Ha non-linear master with an LRGB non-linear master. It worked, but the Ha is not adding anything to the color. Am I missing a step, i.e. mapping the Ha to a R, G or B image?
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What steps did you take exactly? You can certainly do this via the image blend plugin, but you'll want to continuum subtract it first and then make sure you're blending it in the way you expect. I usually leave the saturation a bit low before I blend in my continuum subtracted Ha (or Oiii potentially also if I've done that as well) so I can see the effect, adjust the blending as necessary, and then adjust the saturation a bit afterwards as well.
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Kyle Goodwin: *Hi Kyle, Thank you for responding. When I increase saturation in the Ha non linear master in PI, I don't see any color at all. The LRGB non linear master has plenty of color. I combine the 2 images in Image Blend but the expected increase in Ha doesn't appear. The combined image looks the same as the LRGB non linear master. I'm thinking that I might be missing a step to get the Ha color to reveal itself but not sure what. What do you mean by 'continuum subtract'? Jerry |
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Continuum subtraction is the process of isolating the true Ha emission by removing the “continuum leakage” or just general red that also gets picked up by the Ha filter. So in simple terms you subtract the broadband red from the Ha to get the true “only Ha” signal. Can you share your two files right before you combine them? I can have a look at what can be done to improve the combination even without the continuum subtraction (which would be done earlier, in the linear phase).
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well I understood what's wrong you're adding combining a monochrome HA image to the (color) LRGB, so, the HA will not provide any color Narrowband ColorMapper script can colorize your HA, then you could merge the two the way I would do it is a bit weird (it's not with ColorMapper), so I'm not sure I should share it…  I'd like to know the right way to do this; I guess I'll be learning alongside JerryP.S. splitting the RGB image into it's 3 channels and combining HA with the red does the job, but ruins the color balance; so far haven't done that during linear phase, so I never used SPCC after HA combination |
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Oscar: Oh, perhaps Oscar is right. have you not converted the image you're blending to RGB first or else blended it just into the red channel? I don't know if there's a "right way" to do it. I generally do it with PixelMath (which is why converting it to color didn't occur to me, I do the math on the red and blue channels). You avoid "ruining the color balance" by doing continuum subtraction so the only parts you're adding are the actual Ha highlights. That's for something like a galaxy. Different techniques apply if you have a situation like IFN with Ha mixed in and you want to blend those. This isn't really necessarily a case where there's a "one size fits all" right answer unfortunately. |
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Oscar: *Most likely, it does not. Use NBRGBCombination to combine Ha/OIII to RGB |
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https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.galactic-hunter.com/post/hargb-combination-pixinsight&ved=2ahUKEwja5aPSw92MAxXyADQIHU7XI44QFnoECBQQAQ&usg=AOvVaw0UIP84hy_DZQ-QYf0Cn72e This works on linear images, not sure whether it will work on non linear, have not tried to. It's pretty simple. |
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andrea tasselli:Oscar: Hi Andrea, Does using NBRGB convert the monochrome Ha master to color? Jerry |
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It doesn't need to. It will mask the Ha to the R channel and conversely the OIII to the G/B channel.
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I'd like to know the right way to do this; I guess I'll be learning alongside Jerry