LDN1400 Dark Matter in Holiday Colors

JimFox

Moderator
Staff member
This is really cool! Dark nebulas is something I need to work towards capturing. They aren't easy for sure. This could be just a hair brighter? I think I like the saturation level.
 

Comet Hunter

Well-Known Member
This is really cool! Dark nebulas is something I need to work towards capturing. They aren't easy for sure. This could be just a hair brighter? I think I like the saturation level.
thanks I will try add 1/2 or 1 f stop to see what happens
 

Comet Hunter

Well-Known Member
In Astro, I don't know what is good for either one. But I can provide a technical view of the degree thereof in the OP.

In the GIMP, it is possible to decompose an image into it's color components. In this case, I selected Hue, Saturation, and Lightness (HSL). Here's the saturation map. Saturation is represented by level, 0=none 255=100% ...



The histogram tells us that the average sat. is 6% and the median value, half-way between highest and lowest, is 1.8%, FWIW.

There seems to be a 'black hole' in the middle, sucking in infinite amounts of saturation. ;)

P.S. If celestial body hues are of interest, it is also possible to extract the OP Hues at constant Saturation and Lightness, a trick allowing me to show the hues as RGB colors, not levels.

Anyone interested?
Tell more
 

xpatUSA

Active Member
Tell more
I just accidentally deleted my earlier post but fortunately you quoted it in full. So, talking about the hue of celestial bodies ...

So I extracted the hues from the original and added then as a new layer. The problem with that was that all levels got a color because I had set the Lightness to filled with about 80%.

Fortunately, GIMP allowed me to apply the 'subtract' blending mode giving me this:



Comments welcome.

P.S. Not real pleased with the result. I'll try again sometime
 
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Mike Lewis

Staff Member
Dark nebulae are not easy. I do not yet have a shot of one I am truly totally happy with. Perhaps a brightness between 1 and 2 for me.

ML
 
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