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Bubble - the Beauty of Monochrome?

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#1 the Elf

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Posted 23 September 2019 - 02:41 PM

Hey all,

 

spent hours and hours creating a Ha+RGB version of the bubble but in my eyes the monochrome image, which is of course stretched to more contrast, looks better to me. Opinios?

 

Bubble_2019_low.jpg

 

--- vs ---


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#2 the Elf

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Posted 23 September 2019 - 02:42 PM

Bubble_2019_Ha_low.jpg

 

Ha is 25 x 15 min, 7nm Baader filter. For the color version 61 x 2min OSC was added.

 

best

the Elf


Edited by the Elf, 23 September 2019 - 02:45 PM.

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#3 David_Ritter

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Posted 23 September 2019 - 02:46 PM

I agree, the monochrome version looks better in this case.


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#4 OldManSky

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Posted 23 September 2019 - 02:46 PM

Both have their appeal...I think the mono image conveys more "texture," while the color image conveys more "beauty."  

Entirely subjective, of course. :)

 

Both are well done, though!



#5 SilverLitz

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Posted 23 September 2019 - 02:58 PM

Color does not add anything to this target, as it is basically mono (red).  I think you need significant color diversity in the target for color presentation to be beneficial.


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#6 terry59

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Posted 23 September 2019 - 05:59 PM

Have you tried this approach?

 

http://pixinsight.co...als/narrowband/



#7 View2

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Posted 23 September 2019 - 06:01 PM

Use the HA as lumin

#8 the Elf

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Posted 23 September 2019 - 10:25 PM

Terry, View2

 

my processing was this:

- both data sets deconvolved and denoised

- one copy of Ha stretched to low contrast and removed all stars. Mapped to color, mainly to red, very little blue.

- second copy of Ha stretched to higher contrast, similar to the Ha only image but less

- OSC color calibrated by photometric color correction

- OSC stretched with a lot of color and not too far to keep the stars small

- pixel math combination of the colored starless Ha and OSC, a mix of max and additon -> the RGB stars fill the little black holes left in the Ha image from star removal

- extracted L from OSC

- mixed the second Ha and this L 80:20

- used the mixed als luminance (using Ha only looks too skinny in my eyes, a bit of artificial L brings different sizes to the stars)

 

I read that approach before but I can't see it leads to a pleasing result. As far as I understand it is about dynamic range but this is not the whole story. I tried splitting RGB to channels and mix red and Ha, then combine to a new RGB. The result was poor and suffers from greenish halos in the red nebulosity so I tossed it and tried again as described here. Still learning. Sigh.



#9 the Elf

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Posted 23 September 2019 - 10:29 PM

@all: thank you very much for the feedback

@Mark: I like your way of thinking. I always happen to either like things or dislike but I cannot tell what exactly is the point. Flipping thru my image I indeed like the ones with color diversity. With one execption: the pleiades are all blue and I like them as well. I don't dare starting a thread about criterions of good astro photos.....



#10 geneva_min

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Posted 23 September 2019 - 11:27 PM

One more vote for monochrome.  The 3D aspects really pop in the monochrome.  Both are great images though. 




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