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#1 TheAviator

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Posted 15 August 2019 - 05:02 AM

Hello Folks,

Just a simple and quick question?

How do you combine Ha + OIII data in photoshop?

By simply assigning Ha to Red and OIII to blue and green?
By assigning Ha to red, Ha and OIII to green (as synthetic green) and OIII to blue?
By assigning Ha to red, Ha (20%) plus 80% OIII to green and OIII to blue?

As well with RGB stars...
Do you combine Each RGB already with narrowband data?
I.e. R + Ha, G + OIII(Ha) and B + OIII
before combining?

Thank you!

#2 lucam

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Posted 15 August 2019 - 06:42 AM

In Photoshop, I bring the channels that I want to combine in a color image in as layers, then put a Levels layer on top and assign as a Clipping Mask.  If you want to assign an image to the red color, for example, you will clip the Blue and Green histogram (black point set to 253) and this will assign the image purely to the red channel. Mixes are easy to handle and adjust in this way. Set the image layers to blending mode Screen. 

 

To combine Ha and and R in a RGB image, bring the Ha layer on top of the RGB image, add a Levels clipping mask and clip Blue and Green channels, so Ha only affects the Red channel. Set blending mode to Screen and adjust Opacity. With a layer mask, you can adjust the effect only where you want it. 



#3 TheAviator

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Posted 15 August 2019 - 07:43 AM

Thank you lucam

 

I used cannistras synth green method on veil and I am getting these areas where the color is missing...

 

How can I avoid those?

 

 

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#4 Seanem44

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Posted 15 August 2019 - 07:56 AM

Little tip for you...  spend $15 and buy Annie's Astro Actions.  Very powerful actions that self automate a lot of things.

 

It has a bi-color combine option.  I have had most success though using the Hubble Pallet action and Using Ha as my Sii.  Can not speak highly enough of these actions though.  Truly time saving.



#5 TheAviator

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Posted 15 August 2019 - 08:01 AM

Seanem44 I do own annies actions and used her Ha-OIII combine with synthetic green.

 

But there are other ways to combine Ha + OIII as well, that' what I am trying



#6 Seanem44

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Posted 15 August 2019 - 08:21 AM

Seanem44 I do own annies actions and used her Ha-OIII combine with synthetic green.

 

But there are other ways to combine Ha + OIII as well, that' what I am trying

Ah..  gotcha.  Good luck!  Let us know how it goes.



#7 TheAviator

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Posted 15 August 2019 - 09:04 AM

Well, it looks like this...

 

https://www.flickr.c...eposted-public/

 

Not sure how to improve it...




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