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The Pleiades - Final with HDR


Dmack1

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So this is the final image of M45 with some (about 20 x 120s) shorter subs added and processed as HDR.

The difference is quite subtle although there is a little more structure and contrast in the brighter nebulae. But thats at the cost of some of the fainter outer clouds. If I'm honest I think it probably was not really worth the effort.

But I'd appreciate C&C

New image with HDR

https://cdn.astrobin.com/thumbs/2HDNq7dKX-GR_1824x0_SH1tglsS.jpg

Previous rev (nearly 4 hours 180s)

https://cdn.astrobin.com/thumbs/R0LnqUEpfttj_1824x0_O3Qyqi6r.jpg

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I am a sucker for all the dusty stuff, so I prefer your original and also the blue is IMHO a better shade in the original as well- so the bottom image for me
BTW - you also captured a extremely distant galaxy UGC2838 at 280 Million Light years distant - its probably one of the most imaged galaxies due to it being in the frame for any M45 image. It is upper center just above the Pleiades in your image orientation, I've highlighted it in this snapshot from your image

InkedDavid_M45_UGC2838_Highlight_ink.jpg.620e71ec53c591131235450ada5b4a4c.jpg
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Posted by: @AstronomyUkraine

Both look great, the top one has a weird artifact on the left hand side, did you use flat frames when calibrating your images?

Yes, its a dust bunnie - I was having problems with dust dust moving about during the flats so the flats were not consistent so even after applying them there were some issues. I removed a few using healing brush but that one was not showing on my screen when I was processing although it is very evident on this screen.

 

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Posted by: @Astrobdlbug

I am a sucker for all the dusty stuff, so I prefer your original and also the blue is IMHO a better shade in the original as well- so the bottom image for me

BTW - you also captured a extremely distant galaxy UGC2838 at 280 Million Light years distant - its probably one of the most imaged galaxies due to it being in the frame for any M45 image. It is upper center just above the Pleiades in your image orientation, I've highlighted it in this snapshot from your image

InkedDavid_M45_UGC2838_Highlight_ink.jpg.6e2780610c62d2a66e90e1e1e65650c9.jpg

I'm with you on both the dust and the colour but I do like to see the structure in the clouds too! But you cant have everything.

WOW! I did not know about that Galaxy, thanks for pointing it out -of course now I know its there I will see it every time. 280 Million light years! With my old Canon EOS! How cool is that?

 

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Posted by: @Dmack1

I'm with you on both the dust and the colour but I do like to see the structure in the clouds too! But you cant have everything.

Weeellll - with digital processing you can have most of your cake and eat it - dont know what tools you are using for processing but in Photoshop there is a 'filter' under Sharpen, called 'unsharp mask' - weird name but it has its roots in the days of darkroom tricks of the trade to 'sharpen an image under the enlarger by mixing a negative with a slightly blurred negative (kind of non intuitive I know) and highlight edges, namely 'structure' so I just took your posted jpg and applied a reasonably large sharpen, just to put an emphasis on the way it can work, I used a 10 pixel 'blur' and applied 60pct of the function, normally something between 2-5 does the trick. I also brought your dark point down to around 23-25 which also helps make the nebulousness of M45 'pop'

If you have PS give it a go, personally HDR is more about 'flattening luminance' and not really about highlighting edges, which in our world is gas cloud structures,

Bryan

R0LnqUEpfttj_1824x0_O3Qyqi6r_unsharpmask.thumb.jpg.4efdaf277e1255db53257bbbef1e5ea1.jpg
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