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North America and Pelican ---- again


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  • Stub Mandrel changed the title to North America and Pelican ---- again
1 hour ago, Sonyme said:

Super image. Nice to compare with Hallingskies image of the same nebula. Obviously different equipment but which processing software?   Gary

 

Photoshop and Astra Image. I use Astroflat Pro (which I find only works well if the image is already pretty well balanced).

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1 hour ago, MarkAR said:

Very nice image, always a brave move keeping the green 👍

 

It's a tough call.

 

I want to keep a distinction between Ha (which comes out green) and HA+Sii which comes out yellow.

I don't like the bright green so try and push it using selective colour so Ha is a duller yellow and Ha+Sii is brighter yellow.

 

If I run HLVG weak I get this, which is perhaps better:

236558193_WeakHLVG.thumb.jpg.ce5c2bf4b10844390f255c17da00f12a.jpg

 

If I run strong HLVG I get:

 

1465008433_StrongHLVG.thumb.jpg.69fc12b55a81213de0562ae2bc15b7f7.jpg

 

This is a 'traditional' hubble palette, but always looks a bit dull to me. The problem with HLVG is that it kills yellows stone dead.

 

I have extremely weak Reg/green colour blindness and this may mean that I see the line between lemon yellow and a very yellow green in a slightly different place.

Edited by Stub Mandrel
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On 7/21/2021 at 3:16 PM, MarkAR said:

Like the look of the weak HLVG even better, touch more yellow than lime green.

 

Returning, I think I do too.

 

I did a quick experiment on a photo of a yellow flower (a dandelion relative). Strong turned it a dull orange-brown, weak it stayed yellow, but more saturated. Obviously not what it is meant for but it's clear it 'kills' more acidic yellows if you use the stronger settings - I think it can spoil stars in RGB images too.

Edited by Stub Mandrel
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