Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_30_second_exp_2_winners.thumb.jpg.b5430b40547c40d344fd4493776ab99f.jpg

Adreneline

My first NB - IC443 - I've much to learn!

Recommended Posts

Hi Everyone,

This is my first NB image - 16x600s of Ha plus 16x600s of Oiii - Sii will have to wait for another long, clear night.

I went with the blended channels approach in PixInsight 100% Ha in R, 40% Ha + 60% Oiii in G, and 100% Oiii in B. Using 100% Ha in R and 100% Oiii in G and B resulted in a very red nebula and a distinct red tint to the background.

Any help or suggestions on how it might be improved would be much appreciated - I essentially followed the LVA tutorial.

IC443-Blended_Channels-processed.thumb.jpg.6912f598e0e8b2611eed906e11db3eef.jpg

Thank you for looking.

Adrian

Edited by Adreneline
Update title to include object identifier
  • Like 6

Share this post


Link to post
Share on other sites

Looks good. Did you combine linear or stretched data? I've never done pure NB imaging, but I would think that to have certain ratios, you would need an equal average image intensity for the various filters. Ie, mean(Ha) = mean(Oiii). Just curious; I must check that LVA tutorial.

  • Thanks 1

Share this post


Link to post
Share on other sites
11 hours ago, Hayduke27 said:

What object is this?  Nice image!

Apologies - I should have included the image identifier in the title - it is IC443, the Jellyfish Nebula.

Adrian

P.S. I've now edited the thread title.

Share this post


Link to post
Share on other sites
3 hours ago, wimvb said:

Did you combine linear or stretched data?

Hi Wim,

I combined stretched data as advised in the LVA tutorial.

At the same time I also imaged this target with my 414ex-osc taking 30 x 600s images. I chose not to combine the NB with the RGB(osc) because the FoV was different and the image would have been quite cropped. The osc image is strikingly red! I did mess about extracting the individual channels and combining them collectively and individually with the NB frames but the end result was not at all pleasing.

I am not sure Sii will make a lot of difference but I am keen to try once we get another clear night.

As the LVA tutorial suggests (and web images confirm) you can get just about any colour you like by mixing the components in different/equal ratios.

Thank you for your comments Wim.

Adrian

Share this post


Link to post
Share on other sites
On 11/01/2018 at 08:57, wimvb said:

I would think that to have certain ratios, you would need an equal average image intensity for the various filters. Ie, mean(Ha) = mean(Oiii).

Hi Wim,

This is the result of me trying to achieve what I think you mean by "equal average image intensity" and combining Ha : Oiii : Oiii in R:G:B - this is much closer to the osc image I took at the same time.

IC443-LRGB-Style-PS.thumb.jpg.76e51b0bbc4b111045db8186e2682790.jpg

Adrian

  • Like 5

Share this post


Link to post
Share on other sites

Completely different result, but I like it.

  • Thanks 1

Share this post


Link to post
Share on other sites
On ‎10‎/‎01‎/‎2018 at 23:07, Adreneline said:

Hi Everyone,

This is my first NB image - 16x600s of Ha plus 16x600s of Oiii - Sii will have to wait for another long, clear night.

I essentially followed the LVA tutorial.

Hi Adrian .... can I ask what this "LVA Tutorial" is ? .... and where can I find it?

Mike

Share this post


Link to post
Share on other sites
1 minute ago, SlimPaling said:

Hi Adrian .... can I ask what this "LVA Tutorial" is ? .... and where can I find it?

Hello Mike,

I use the Light Vortex Astronomy site quite a bit - at least as a starting point.

http://www.lightvortexastronomy.com/tutorials.html

In particular I used this one as a basis for experimenting with my NB data:

http://www.lightvortexastronomy.com/tutorial-narrowband-bicolour-palette-combinations.html

Adrian

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By StaceStar
      I get a bit of a kick out of dragging as much out of minimal data as possible
      Took this last night, packed up early though as it was getting icy and treacherous. I think by the time I packed away it was -5c.
      Anyway this one actually came out better than i expected and i'm pretty pleased so far
      55x120s stacked and processed primarily in APP and final touch up in Photoshop. Also used my L pro max filter for this, which no doubt helped.
       
       
       

    • By PeterW
      @Stu, @GavStar and myself met up for a bit of club observing Thursday night… cloudy so good that we met down the pub. Someone (not sure who) pointed out it was clear, so we headed out to stand and chat under clouds with a chill breeze for more than 2hours waiting for the skies to comply with Sat24. Finally we spotted what looked like the edge of the clouds… the others got ready to polar align. OK observing under a near full moon is not ideal.. but it does help with setup and checking your charts! 
      So what to look for… using Gavins new  “magic eyepiece” we headed straight for the Horsehead, just visible, the flame slightly more so above. We were using a TEC160 on a goto panther mount, with 55mm plossl and the TNVC adapter to the intensifier, using  a 6nm hydrogen alpha filter to “help”. The gain control worked really well to tune the balance of brightness (and noise) vs detail. The “white phosphor” giving a very neutral and “natural” view.
      Right, where next? Up to the jellyfish ic443, nice gentle curve easily visible, checked on the monkeyhead nearby. We then cruised down to the seagull which filled the view and then tried to ferret out the medusa Nebula… it evaded us this time. Swept over the the pacman, the heart and then the California nebula. The latter as two broad nebulous bands crossing the field of view. We need to try a smaller scope to give a bigger field of view for these really big nebulae.
      Swapped in a longpass filter and checked on M35 which looked great, M3? and then M81/82, very clear dark lane in the latter.. Clouds finally made a return and we packed up the wrong side of 1am, feet nearly frozen solid. Seemed like many of the streetlights had turned off as well, which is interesting to note. Going to be fun to poke this setup at nebulae when the skies are a little bit more conducive to observing.
      PeterW
       
    • By alan4908
      This is an LRGB image with Ha blended in the Lum and Red channels.
      The Lum was quite faint, even after over 3hours, so I decided to blend quite a large amount of Ha in order make the image reasonably bright and not too red. The Ha is also blended into the Red channel but at a much lower level.  I made a slight change to the Hue, towards the green, in order to get a slightly more appealing red.  In total, the image represents about 13 hours integration time. 
    • By alan4908
      First a slight aside: I quite like trees but they can be a bit frustrating when you have a target object (eg IC443) that is visible for a couple of hours, disappears behind trees for a couple of hours, reappears for a couple of hours and then finally disappears. To overcome this I've programmed ACP with my highly undulating horizon so my scope acquires other objects when others are hidden - the joy of automated imaging...
      Anyway, back to the image which represents about 13 hours of integration time - I decided to go for a LRGB image with an Ha blend in both the Lum and Red channels. I was surprised that even with a relatively long exposure on the Lum it didn't pick up more of the nebula,  so I decided to blend a higher than my normal Ha percentage into the Lum so that it would appear reasonable bright and not too red.
      Alan

       
       LIGHTS: 20; R:10; G:10; B:19 x 600s; Ha:7 x 1800s. DARKS:30; BIAS:100; FLATS:40.
       
    • By gorann
      Now, when I finally have some clear skies, the moon spoils it all, so I have played around with data from last month on the Jellyfish Nebula. It is my DSLR data with Francois Theriault's CCD Ha data as luminosity.
      Equipment in Sweden: ES 127ED refractor with TS 0.79x reducer (=f/5.9) IDAS filter and Canon 60Da on EQ8. Equipment in Canada Antares 8" Newtonean (f/5) and SBIG ST8300M and Bader Ha 7nm filter on CGEM.
      65 x 300" exposures = 5.4 hours

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.