Chanel Combination

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Graeme1858 Great Britain
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Chanel Combination

#1

Post by Graeme1858 »


So I've downloaded the free trial of PixInsight and I'm watching videos and tutorials. I've had a few goes of the AP Processing Challenge And I'm generally having a great time!

There's a Discord Astrophotography group that does a processing challenge (they probably saw it here!) This month they have a narrow band data set of NGC7000 the North America Nebula. There's an Ha file, an Sii and an Oiii. The data is good but I'm struggling to align them. I've used Channel Combination and I've had a go with Pixel Math.

What's the secret?

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Graeme
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Re: Chanel Combination

#2

Post by OhNo »


No secrets really! More like an understanding of what the tools on a processing program can do. I am at the basic level of understanding PixInSight, but I'll try.... The data you have can be used in two ways to end up with either a SHO image or a HOO image.

How I learned to process a HOO image is to use the LRGB combine tool in Pix. I un-check the "L" box and put the Ha calibrated and registered data in the Red channel, And the calibrated and registered Oii data in the Green and Blue channels. Other times, depending on data quality I may use the Ha data in the L channel rather than the Red channel.

In the case of a SHO image I un-check the L channel in LRGB combine, use at SII data in the Red channel, Ha in the Green Channel and Oiii in the Blue channel. Then I have to run SNRC Noise (Green), invert run SNRC Noise (Green), invert again. With this image, adjustments to taste (ie. color saturation, hue....).

PixInSight can seem overwhelming, and needs to be explored and tried so the user becomes comfortable with what it can do. Personally I doubt I use much of it's true potential!

Hope someone more experienced than me chimes in.
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Re: Chanel Combination

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Post by XCalRocketMan »


OhNo wrote: Wed Jun 23, 2021 10:04 pm ...

In the case of a SHO image I un-check the L channel in LRGB combine, use at SII data in the Red channel, Ha in the Green Channel and Oiii in the Blue channel. Then I have to run SNRC Noise (Green), invert run SNRC Noise (Green), invert again. With this image, adjustments to taste (ie. color saturation, hue....).
...
If you don't mind ... I'm curious about the use of SNRC with inverted image ... what exactly is that accomplishing and why?
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Re: Chanel Combination

#4

Post by OhNo »


In my case the original SBRC (Green) gets rid of the Green hue, but leaves purple(ish) stars. The inverted SNRC gets rid of the Purple stars leaving a much more natural colored image.
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Re: Chanel Combination

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Post by Graeme1858 »


OhNo wrote: Wed Jun 23, 2021 10:04 pm In the case of a SHO image I un-check the L channel in LRGB combine, use at SII data in the Red channel, Ha in the Green Channel and Oiii in the Blue channel. Then I have to run SNRC Noise (Green), invert run SNRC Noise (Green), invert again. With this image, adjustments to taste (ie. color saturation, hue....).

Thanks for that Brent. I'll give LRGB Combine a go.

But I'm wondering if there's a setting in Pixel Maths that I'm missing that aligns the stars to make the combining more accurate?

I'm not finding PixInsight too overwhelming, more like intriguing and impressive! And I'm enjoying learning the processes I've used so far. Definitely going for it when the trial expires.

Regards

Graeme
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Re: Chanel Combination

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Post by yobbo89 »


Graeme1858 wrote: Thu Jun 24, 2021 5:19 am
OhNo wrote: Wed Jun 23, 2021 10:04 pm In the case of a SHO image I un-check the L channel in LRGB combine, use at SII data in the Red channel, Ha in the Green Channel and Oiii in the Blue channel. Then I have to run SNRC Noise (Green), invert run SNRC Noise (Green), invert again. With this image, adjustments to taste (ie. color saturation, hue....).

Thanks for that Brent. I'll give LRGB Combine a go.

But I'm wondering if there's a setting in Pixel Maths that I'm missing that aligns the stars to make the combining more accurate?

I'm not finding PixInsight too overwhelming, more like intriguing and impressive! And I'm enjoying learning the processes I've used so far. Definitely going for it when the trial expires.

Regards

Graeme
In pixinsight, you can use the "staraliaghnment" tool. The default settings should work,I'm pretty sure there is a channel shift option like registacks to allign channels accurately like when working with planets.
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Re: Chanel Combination

#7

Post by Graeme1858 »


Cheers Rob

I'll have a look at that when I get in tonight.

Regards

Graeme
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Re: Chanel Combination

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Post by OhNo »


yobbo89 wrote: Thu Jun 24, 2021 10:21 am
Graeme1858 wrote: Thu Jun 24, 2021 5:19 am
OhNo wrote: Wed Jun 23, 2021 10:04 pm In the case of a SHO image I un-check the L channel in LRGB combine, use at SII data in the Red channel, Ha in the Green Channel and Oiii in the Blue channel. Then I have to run SNRC Noise (Green), invert run SNRC Noise (Green), invert again. With this image, adjustments to taste (ie. color saturation, hue....).

Thanks for that Brent. I'll give LRGB Combine a go.

But I'm wondering if there's a setting in Pixel Maths that I'm missing that aligns the stars to make the combining more accurate?

I'm not finding PixInsight too overwhelming, more like intriguing and impressive! And I'm enjoying learning the processes I've used so far. Definitely going for it when the trial expires.

Regards

Graeme
In pixinsight, you can use the "staraliaghnment" tool. The default settings should work,I'm pretty sure there is a channel shift option like registacks to allign channels accurately like when working with planets.
I have always assumed the the "StarAlignment" is the registration tool. I also assume that the Pix tools Like StarAlignment are Pixel Math algorithms that are named as a tool.

I deliberately don't use some of the Pix tools. One example is the "Weighted BatchProcessing" tool. I have a couple reasons for my decision. First it creates a bunch of saved residual file that just sit on the hard-drive taking up space. The second reason is until the new release of Pix came out, no matter how many different ways I used it it failed to get rid of my amp glow from the ASI183MM Pro. Time wise DeepSkyStacker is quicker, leaves no redundant files and works my specific problem.

I should add that while PixInSIght does a very good job, most of the better imagers seem to use a supplemental program for fine tuning.
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Re: Chanel Combination

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Post by Graeme1858 »


OhNo wrote: Wed Jun 23, 2021 10:04 pm How I learned to process a HOO image is to use the LRGB combine tool in Pix.

Same effect:

LRGBCombine.JPG
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Re: Chanel Combination

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Post by Graeme1858 »


yobbo89 wrote: Thu Jun 24, 2021 10:21 am In pixinsight, you can use the "staraliaghnment" tool.

Yeah, that nailed it:

Capture.JPG

Need to sort out the colours a bit though!

Regards

Graeme
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Re: Chanel Combination

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Post by OhNo »


So the fliter stacked filter images were not registered to each other. LOL You skipped a step skippy! :shock: :lol:
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Re: Chanel Combination

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Post by Graeme1858 »


OhNo wrote: Thu Jun 24, 2021 9:15 pm So the fliter stacked filter images were not registered to each other. LOL You skipped a step skippy! :shock: :lol:

Yeah, my mistake, the three images were registered and stacked but not to each other!

A bit too much Green cast and the Saturation is too much but it was fun to play with!

Discord AP NGC7000.jpg
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Re: Chanel Combination

#13

Post by OhNo »


A Quick SNRC Noise (Green at default) 'll fix 'er right up! But you play to your music, after all it is your impression...... :popcorn: :D
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Re: Chanel Combination

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Post by Jockinireland »


Hi Graeme, now you have the imges aligned you should give the SHO-AIP script a try . You'll find it under scripts/multichannel synthesis.

It's fairly simple and intuitive to use and allows you to quickly trial various combinations of the data, including throwing on a lum layer. I don't yet know how to adjust the sliders to get the colours I want but it's easy enough to go trial and error till you get it. Even on my ancient low spec laptop each render takes less than a minute.

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Re: Chanel Combination

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Post by Graeme1858 »


Jockinireland wrote: Sat Jun 26, 2021 8:28 am you should give the SHO-AIP script a try

Cheers David, I'll have a look at that.

Regards

Graeme
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APM 11x70 ED APO Binoculars.

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