NGC6914, VdB 131, 132 and surrounding area

[Jordi Gallego]

Hi all,

I have just finished processing of my last image. It is a widefield image in Cynus with NGC6914 nebula in the center.
Image taken with TOA-150 and STL11k. Exposure:  9x20 min RGB + 9x30 min Halpha (Astrodon filters).

This is the image at 800 pixel wide:



This is link to a higher resolution (66%) version:

http://jordigallego.fotografiaastronomica.com/album/Files_dark_sky_SBIG/NGC6914_widefield.jpg

and this is a close-up of central nebulosity (ay 100%):

http://jordigallego.fotografiaastronomica.com/album/Files_dark_sky_SBIG/NGC6914_detail.jpg


Best regards
Jordi

[sleshin]

Sweet. Love the vibrant color.

Steve

[Yuriy Toropin]

Really nice shot and processing, thanks a lot for sharing!
   -Yuriy

[Harry page]

Hi

I need sun glasses for this  8)    LOve it

Harry

[Alejandro Tombolini]

It's very nice, exellent job!!!

Felicitaciones.

Alejandro.

[Jordi Gallego]

Thanks for you comments Steve, Yuri, Harry and Alejandro

Best regards
Jordi

[oldwexi]

Hi Jordi!
I think thats a Master Piece!
And the processing for me looks perfect. All kind of nebulae clearly
visible in their respective color.
I like this region of NGC6914 and i personally have not seen a better image of that region!
A master piece. Congratulation.

Gerald

[Jules]

A lovely image Jordi, congratulations!

Regards

Julian

[Robovet]

Jordi,

Could you possibly elaborate on your steps to combine the HA & Red to achieve such rich color---

Love it--

Thanks

Marc

www.robovet.net

[Jordi Gallego]

Thank you for your comments Gerald, Julian and Marc

Could you possibly elaborate on your steps to combine the HA & Red to achieve such rich color---

Marc, combining Ha with other wideband data and geting a good result is always a dificult task (at least for me  ). I have used diferent methods depending on the characteristics of the images. In this case I used a method suggested by Vicent Peris. You can see it here (described by Jack Harvey):

http://pixinsight.com/forum/index.php?topic=2298.msg15353#msg15353

After following the indicated steps, I made different tests on the final mixing ratio and found that the best looking for me was 0.60Ha 0.4R, and this was the one used in this image.

Regards
Jordi
 

[marekc]

Hi Everyone,

I hope I'm not taking this discussion too far afield, but I thought I'd ask some questions about how these HaLRGB `blending' techniques fit into other parts of the overall `PI workflow'... Feel free to let me know if I should make this a new thread in a different part of the forum.

I recently acquired data on M16 (the Eagle nebula) from a very dark site. I got 2 hours (=24x5min) each of L, R, G, and B, all unbinned. I also got 5 hours (=20x15min) of Ha, also unbinned. All of these data have been calibrated, registered, and integrated in PI. I now have a master frame for each of: Ha, L, R, G, B.

Clearly, at this point, I can make an RGB image from my R, G, and B. I could also make an LRGB image. And I could dig into various posts listed in this thread, to see how to make some sort of HaLRGB image.

What I'm wondering is... where should things like sharpening and smoothing fit into all of this? It seems to me that the overall philosophy of PI is, broadly speaking, rather like the `Astro Zone System': 1) Use some sort of sharpening on the high-SNR areas (e.g. Deconv or an ATWT-based method), and 2) Use some sort of smoothing on the low-SNR areas (either ACDNR or an ATWT-based method). Juan has given us some nice instructions on how to do these things, in various posts. There are also processing examples on other parts of the PI site. Some methods should be applied to linear data, some to non-linear, but that's all been discussed elsewhere.

Mostly, I'm wondering when I should do these sharpening and smoothing operations. Should I do some sort of blending of the Ha, L, and RGB data while still linear, and THEN do the sharpening and smoothing on the resulting image? Or should I do various things to the Ha, the L, and the RGB, (probably not the same things to each image) and then combine?

It looks like there are various ideas for how to combine Ha, L, and RGB, but I'm just confused as to how these steps relate to the OTHER parts of the workflow. If anyone has any thoughts on this, I'd be very curious to hear.

Thanks,

- Marek