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IKO - LBN487 Iris Nebula LRGB - Processing Competition


Grant
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Here is my entry, last minute once again! Workflow as I remember it:

1. AstroPixelProcessor: combine LRGB - light pollution correction - star colour calibration - histogram stretch

2. Affinity Photo: selective colour to reduce green and magenta - curves - levels adjustment

3. Starnet++: remove stars

4. Topaz DeNoise AI - noise reduction on starless image

5. Affinity Photo: add starless image from last step as a layer on top of image from step 2- set to overlay - apply high-pass filter to bring out medium-scale detail - repeat with another layer to bring out large-scale detail

6. Topaz DeNoise AI: noise reduction and sharpening on image from step 5

IrisNebula-LRGB-lpc-cbg-csc-mod-St-post2-DeNoiseAI-clear.jpg

Edited by cfinn
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On 03/05/2021 at 20:44, cfinn said:

Here is my entry, last minute once again! Workflow as I remember it:

1. AstroPixelProcessor: combine LRGB - light pollution correction - star colour calibration - histogram stretch

2. Affinity Photo: selective colour to reduce green and magenta - curves - levels adjustment

3. Starnet++: remove stars

4. Topaz DeNoise AI - noise reduction on starless image

5. Affinity Photo: add starless image from last step as a layer on top of image from step 2- set to overlay - apply high-pass filter to bring out medium-scale detail - repeat with another layer to bring out large-scale detail

6. Topaz DeNoise AI: noise reduction and sharpening on image from step 5

IrisNebula-LRGB-lpc-cbg-csc-mod-St-post2-DeNoiseAI-clear.jpg

A good result but what struck me was your phrase 'reduce green and magenta.'  These colours are on the same colour axis so I'm not sure what you're reducing...

Olly

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55 minutes ago, ollypenrice said:

A good result but what struck me was your phrase 'reduce green and magenta.'  These colours are on the same colour axis so I'm not sure what you're reducing...

Olly

Hi Olly,

Perhaps you can help me understand this better. I was essentially trying to reduce/remove the nasty green halo from the bright star bottom left and also to remove some purple mottling in the background, which amounted to playing around with the selective colour sliders for both green and magenta in Affinity Photo. It seemed to do the trick and also helped me get to an overall colour balance I was more happy with. Do let me know if there is a better description for this process or if there are better ways to do it. It was the one part that was just trial and error for me so I would love to develop a more theoretical understanding.

Charles

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4 minutes ago, cfinn said:

Hi Olly,

Perhaps you can help me understand this better. I was essentially trying to reduce/remove the nasty green halo from the bright star bottom left and also to remove some purple mottling in the background, which amounted to playing around with the selective colour sliders for both green and magenta in Affinity Photo. It seemed to do the trick and also helped me get to an overall colour balance I was more happy with. Do let me know if there is a better description for this process or if there are better ways to do it. It was the one part that was just trial and error for me so I would love to develop a more theoretical understanding.

Charles

I think what olly means is, if you reduce green the image will become more magenta, if you reducer magenta it will become more green as they are on the same colour axis so are affect each other. 
Lee

 

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Just now, Magnum said:

I think what olly means is, if you reduce green the image will become more magenta, if you reducer magenta it will become more green as they are on the same colour axis so are affect each other. 
Lee

 

I see! Goodness, I think I will revisit this when I get the chance so I can more accurately describe and understand what I did. I’m keen to ensure what I’ve done is reproducible and makes sense.

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14 hours ago, Magnum said:

I think what olly means is, if you reduce green the image will become more magenta, if you reducer magenta it will become more green as they are on the same colour axis so are affect each other. 
Lee

 

Yes, Lee's right. This is what I meant. You're working on a see-saw with green and magenta, if you like.

Olly

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Far too late to enter for this, so I hope it’s okay to share my version to this thread?

PixInsight (roughly from memory) - arcsinh stretch, LRGB combine, Starnet, curves on the starless part, enhance dark structure script, add stars back in then scnr green

Lovely to have data that doesn’t fight back, thank you!

E7ABBE28-13B9-40A4-8C1F-2765B004C6F8.thumb.png.a9ac7bd780fe5591823dfed009e84abf.png

Edited by Yawning Angel
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  • 3 weeks later...

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