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RGB Combine tool for splitting OSC channels?  

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(@anilketkar)
Molecular Cloud Customer
Joined: 1 year ago
Posts: 5
December 29, 2018 00:57  

Hello : I am wondering if I can use the RGB combine (or any other tool in APP) to split out LRGB channels from an OSC (One Shot Color) image out of a DSLR. I use a narrowband filter with 2 bandpasses. One is for deep red Hydrogen Alpha (HA) and the other is  wider bandpass in blue/green to capture both H-Beta and 2 lines of OIII.

Many times, the red HA is very dominant and then image turns out dominated by red. I was wondering about perhaps splitting out the blue/green channels and enhancing them and then recombining them (at the linear stage). Is that doable with any of the tools in APP, like the RGB combine? I have tried, but not had much success in doing so. If it is possible, I would like to know the whole process flow from a calibrated, integrated linear OSC image to a recombined image with enhanced blue/green channels. If needed, I can post a link to one of my recent integrated NB images taken with the DSLR/dual band filter combo. Thanks for any pointers you can give ..... Anil


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(@kijja)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 43
December 29, 2018 08:06  

HI,

I Think Mabula pointed on this in some earlier posts. My approach is yes, we need RGB combine tool for adjusting the colors to look right for our eyes. If you using only 2 channels try H-alpha to red, Oiii to green, and Oiii(again) to blue. Then, adjust the percentage of each color to make the image looks good on create button. If you want to add H-alpha to RGB from OSC, you needed to split the RGB image in to red, green, blue monochrome by using the calibrate menu on the lowest section of save calibrated frame. Load these monochrome frames and H-alpha; calibrate, normalize the split monochrome frames with H-alpha, save these normalized frames. Then combine them in RGB combine in tools menu.

Kijja

This post was modified 6 months ago 2 times by Kijja

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(@jw_duijndamhetnet-nl)
Red Giant Customer
Joined: 2 years ago
Posts: 69
December 29, 2018 21:30  

Hi Anilketkar,

If i understand it good you own a dual narrowband filter.

Try to read the release notes for 1.068. In this release Mabula made a special debayer protocol for this kinds of filters. This protocol split automatically the Ha and O3(this also includes the h-beta region) is seperate layers.

After processing you could load them into the combine tool with for example a RGB stack (register them first to each other RGB, ha, o3). And than load them. In the combine tool you can address them to the diserd colour. Example you could use h-beta / o3 for both green as blue channel.

 

Maybe this helps you a bit.

Clear skies, Jan-Willem


(@kijja)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 43
December 31, 2018 03:18  

Hi Anilketkar,

The post I mentioned is Mabula's answer on the topic 'Combining RGB to Ha' in 'Tutorials& Workflow' forum. It is very helpful to read from the first thread.

Regards,

Kijja


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(@anilketkar)
Molecular Cloud Customer
Joined: 1 year ago
Posts: 5
December 31, 2018 05:53  

Thanks, Kijja and Jan for your replies. I read the post Kijja referred to in his post and it seems to provide some useful info there. I ma now trying to utilize that to improve my dual NB images taken with an OSC (an H-Alpha modded DSLR). However, I a, still uncertin how I go about using those options. Any hints or write-ups from Mabula on how to use the debayer for HA vs for OIII channels? TIA ..... Anil


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(@jw_duijndamhetnet-nl)
Red Giant Customer
Joined: 2 years ago
Posts: 69
December 31, 2018 12:44  

Hey Anil,

As my suggestion try to read in the section for release the note of 1.068. Here Mabula explains the debayer patterns. 

My suggestion would be just extract the HA an O3 from the data. You get mono images, these images you can load in the combine tool. If you have RGB form you're dslr you can combine them.

If you use these debayer patterns you can easy extract your data.

Kind regards Jan-Willem


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(@jw_duijndamhetnet-nl)
Red Giant Customer
Joined: 2 years ago
Posts: 69
December 31, 2018 12:58  

Hey Anil,

Quick an other question, do you use a dual narrow band filter or only a O3 filter?

I have also a modded DSLR (just pulled out the ir filter so it is sensitive for HA. If you shoot without a HA filter you don't get HA data just RGB data with extra HA tones in the red layer.

Jan-Willem


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