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Terry R
member


Reged: 01/31/13

Loc: Australia
Raw Data available for Tarantula Nebula 17 hours
      #5803994 - 04/17/13 06:40 AM Attachment (99 downloads)

Hey guys,

I submitted the image, Tarantula Nebula under Urban Skies - 17 Hour exposure in the Feb image/sketching contest. Well, why not let others play with the data. I am making it available under the condition that you show the results and let us know what you did. I would like to know as I am trying to learn this image processing stuff.

I know there is coma and image tilt Ė and it kills me. Iím still working that stuff out. Several nights the scope was buffeted by winds, but in the end, there is a lot of data available. This image started out as an experiment. I think it took seven nights when stuff actually worked. On those nights, the drill was dragging the mount out and setting the gear up from scratch, polar aligning, imaging, and then tearing it all down again after a nights imaging. It seems that the norm here is for the clouds to roll in after setting up and polar aligning. Thatís harsh. Well, at least I mastered the whole polar alignment in the city with no pole star (Southern Hemisphere).

Location:
Melbourne Australia. (15 km from CBD)

Gear:
Vixen R200SS with comma corrector (f4 8 inch newt) Ė stock focuser
Astro-Physics AP900 mount.
First generation ST-8300 mono running at -15C
Baader Narrowband Filters: SII 8nm, H-alpha 7 nm, and OIII 8.5nm

Exposure times:
SII 17 x 20 min mapped to Red
Ha 18 x 20 min mapped to Green
OIII 16 x 20 min mapped to Blue

Pre Processing
CCDStack2 was used to calibrate, register, normalize, perform data rejection, and final stacking. The three FITs images are not sharpened in anyway. They are just as they came out of the camera Ė ready for processing Ė so Iím not hiding any mistakes here. This is meant to be a learning exercise.

Data in the raw is available atÖ

https://www.dropbox.com/sh/386725d20zyy0j8/sIpaxhHYDI

The three images are in Fits format Ė 32 meg each. One for SII, Ha, and OIII.

Have fun; letís see what you can do.

Terry Robison


Edited by Terry R (04/17/13 06:47 AM)


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Mark72
professor emeritus


Reged: 09/19/12

Loc: Munich, Germany
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Terry R]
      #5804026 - 04/17/13 07:19 AM

Thanks for sharing Terry!

Do you have the stars/RGB by any chance?

Mark


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Terry R
member


Reged: 01/31/13

Loc: Australia
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Mark72]
      #5804032 - 04/17/13 07:31 AM

Sorry, I live in the city. It's narrowband or nothing. But I can offer you narrowband. You could try I Bi-Colour image. I think that's done with Ha and OIII to give a RGB like image.

Terry


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Mark72
professor emeritus


Reged: 09/19/12

Loc: Munich, Germany
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Terry R]
      #5804059 - 04/17/13 07:52 AM

OK, Thanks Terry.

I was just asking for star colours - 1 min subs would do;)

Mark


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microstar
Pooh-Bah


Reged: 01/05/08

Loc: Canada
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Mark72]
      #5804409 - 04/17/13 11:49 AM

Thanks Terry. I'll give it a shot, although work pressures will keep me from doing so for the next week or so. I'd like to see it in the natural color narrowband palette I use. It's a stunning object that I've only ever viewed once in a 2007 visit to your area so it will be a treat to work on it.
...Keith


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David Ault
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Reged: 09/25/10

Loc: Georgetown, TX
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: microstar]
      #5804574 - 04/17/13 01:44 PM Attachment (49 downloads)

Terry,

Thanks for posting this. I would love to see this in person, but this is almost as good as being there and better in a lot of others, especially when the data is so fantastic! Below is my version which I processed in PixInsight, blending SII, Ha & OIII into an RGB approximation. I made some HDR tweaks to try and make the core more visible. I also tried some deconvolution which had some good and bad results. Even with masking it was difficult (at least with my current knowledge) to get improvement in most of the image without causing some artificial appearance in the core. It was fun working with this data and I really appreciate you putting it out there for others to muck with

Regards,
David


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Scotty H
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Reged: 11/15/10

Loc: Surrey,UK
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Terry R]
      #5804937 - 04/17/13 05:18 PM Attachment (45 downloads)

Hi Terry

Thanks for the data

Used Pixinsight using histogram stretch, HDR Transformation then combined using pixelmath SII for R/K, Ha for Green, OIII for Blue to create RGB image, extracted luminance from RGB, another Histogram stretch on luminance then recombined to RGB image, saved as 16bit Tiff. Transferred to CS6 for selective colouring, soft colour gradient removal using a mask then played with saturation and unsharp mask. Saved as JPEG for here. Phew

Scott


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Terry R
member


Reged: 01/31/13

Loc: Australia
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Scotty H]
      #5805498 - 04/17/13 09:13 PM

Looks cool. I like all that extra faint detail you guys are pulling out of the data. In the orientation presented, the bottom of the image is moving into the Large Magellanic Cloud, and the top of the image is just on the rim of the Large Magellanic Cloud. At first I thought I had a large gradient in the image.

Have a look at http://apod.nasa.gov/apod/ap090916.html and you will see what I mean. The image is almost in the same orientation. It is a very bright object with a bright bits all over.

Terry


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kbev
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Reged: 12/29/10

Loc: Far, far east Mesa
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Terry R]
      #5806069 - 04/18/13 04:02 AM

Wow, what a great learning experience! I tried for a more normal color balance so I looked around and found a thread on the PI forum about combining these channels for a psuedo-RGB, what I used was pixelmath for the combine with the following settings:
Red = SII + 0.78*Ha
Green = 0.15*Ha + OIII
Blue = OIII

After that it was a pretty standard workflow, final touchup was done in CS5. Here it is:


Edited by kbev (04/18/13 04:03 AM)


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steveyzh
super member


Reged: 02/20/11

Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Terry R]
      #5808289 - 04/19/13 08:29 AM

Thanks Terry for the great raw data!


Processing steps:
1. Ha MDL DDP(FFT lowpass 10%cutoff)
OIII MDL DDP(FFT lowpass 15%cutoff)
SII MDL DDP(FFT lowpass 17%cutoff)
2. J-P Tone mapping method for Ha,Oiii,Sii(after DDP)
3. DBE in Pixinsight LE 1.0 for Sii tonemap layer;
4. Creat Luminance from Ha+Oiii(lighten 10%)+Sii(lighten 10%) in Photoshop CS3
5. Creat SHO Tone mapping Color in Photoshop CS3, Hubble Palette selective color;
6. Luminance+SHO in Photoshop CS3

Steve


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snommisbor
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Reged: 06/15/09

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Re: Raw Data available for Tarantula Nebula 17 hours new [Re: steveyzh]
      #5808473 - 04/19/13 11:00 AM

Those are all awesome but I must say I am partial to the Hubble Palette of Steve's, but Terry yours actually shows off the gas and dust a little better than any of them. The more muted colors makes it look more mysterious which is a very cool look.

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Miles Zhou
newbie


Reged: 04/20/13

Loc: MA, USA
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: snommisbor]
      #5810515 - 04/20/13 10:15 AM

Thanks for the raw files. Here is mine:
http://orianhealth.com/mediawiki/index.php?title=File:Tarantula.jpg

Process:
MDL: DDP+Gamma(0.7)
PI: DBE
PS: Balance RGB=SHO; L=H(100%)|S(15%); Highlight Overlay; and final touch (Brightness/Contrast)


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microstar
Pooh-Bah


Reged: 01/05/08

Loc: Canada
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Miles Zhou]
      #5812007 - 04/20/13 10:47 PM Attachment (27 downloads)

Here's my effort in a slightly different palette. The Ha, OIII and SII stacks were given a mild DDP as 32bit files before conversion to 16bit and importing into Photoshop CS5. The lights were layered as a natural color narrowband version with R=Ha+30%SII; G=OIII, B=OIII+24%Ha, and 30% SII brought in as a Yellow channel. All color channels were generated using clipping masks. I find that layering the SII as a Yellow channel balances the color of the stars better and highlights the SII regions in orange to distinguish the SII regions better. The large and medium features were sharpened using Topaz Labs Detail. Noise in the fainter region was reduced using a Noise Ninja layer with an inverse mask. Carboni's Tools were used to Increase Star Color, and star size was reduced using Annie's Actions Reduce Star Size. A final color balance was applied using Levels, with a final tweaking in Topaz Detail, then the background darkened using a Soft Light layer with an inverse mask.

Thanks for putting your data files up Terry. It was fun and very interesting to see the different versions; I love the work people are able to do with PixInsight, but I'm just not up for re-inventing my processing workflow and getting past PI's steep learning curve. This wasn't the same as processing my own lights somehow, but it was great to get a chance to work on a region that I'm unlikely to get the opportunity to collect for myself.
...Keith


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Stevous
sage


Reged: 09/01/09

Loc: Melbourne, Victoria, Australia
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: microstar]
      #5812267 - 04/21/13 03:15 AM

Well done to everyone the pictures all look great.

Steve


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Paramount
sage


Reged: 03/03/08

Loc: Hereford UK
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Terry R]
      #5812343 - 04/21/13 05:04 AM Attachment (34 downloads)

Hi Terry
Thanks for the data, here is my go at processing it, its a shame but I don't get to see this nebula from where I live
Best wishes
Gordon

Processing
Stretched in Maxim DL using gamma stretch with value of 0.1 at maximum pixel value and 16 bit, then saved to 16 bit tiff with a linear screen stretch
Equalise histograms in CS5 then colour combine to HST palette
combination of levels and curves with some minor contrast curves adjustments
Selective colour adjustments
High pass filter

Edited by Paramount (04/21/13 05:15 AM)


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Driven1
super member


Reged: 08/19/10

Loc: N. Central PA near CSSP
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Paramount]
      #5812495 - 04/21/13 08:48 AM

^ Wow Paramount! Nice! Pulled some amazing detail. Great job!

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Paramount
sage


Reged: 03/03/08

Loc: Hereford UK
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Driven1]
      #5813565 - 04/21/13 05:21 PM

Hi
I have enclosed a link to the full size version of my effort at processing Terry's data. Thanks again to Terry for providing the data
http://www.pbase.com/imaging_the_heavens/image/149796215/original
Best wishes
Gordon


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Paramount
sage


Reged: 03/03/08

Loc: Hereford UK
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Driven1]
      #5813566 - 04/21/13 05:21 PM

Hi
I have enclosed a link to the full size version of my effort at processing Terry's data. Thanks again to Terry for providing the data
http://www.pbase.com/imaging_the_heavens/image/149796215/original
Best wishes
Gordon


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Terry R
member


Reged: 01/31/13

Loc: Australia
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Paramount]
      #5814666 - 04/22/13 05:22 AM

Itís really amazing how processing can yield such different results from the same data. I really have to thank everyone for sharing their processing steps, itís been fantastic. Iím still struggling to get any blue out of the data. Looks like a lot of people are using PixInSight in their processing.

Terry


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jgw12936
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Reged: 03/28/07

Loc: The Woodlands, TX
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Terry R]
      #5814794 - 04/22/13 08:09 AM Attachment (30 downloads)

Thanks Terry for the data! Really fun to process.

I did mine in CCDStack and PS3


Jim

Edited by jgw12936 (04/22/13 02:13 PM)


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Warhen
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Reged: 11/12/05

Loc: WV, USA
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: jgw12936]
      #5820101 - 04/24/13 03:52 PM

Very impressive processing all. I'm not attracted to most NB images (love grayscale Ha), but really interesting to see your great results w/ differing methods.

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bluedandelion
Carpal Tunnel
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Reged: 08/17/07

Loc: Hazy Hollow, Western WA
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Warhen]
      #5821216 - 04/25/13 02:10 AM

This data is too good to pass up. So I spent several hours on this. Terry, you are most generous

Two blends in parallel follow. Will post additional processing details tomorrow.

This blend follows Juan Conjero's (lead developer of PI) suggestion for a more "natural" palette.
R: 0.5*S2 + 0.5*Ha
G: 0.15*Ha + 0.85*O3
B: O3

Large version on Flickr
- Ajay

Edited by bluedandelion (04/25/13 02:19 AM)


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bluedandelion
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Re: Raw Data available for Tarantula Nebula 17 hours new [Re: bluedandelion]
      #5821218 - 04/25/13 02:14 AM

Here is the traditional Hubble Palette.
R: S2
G: Ha
B: O3

Large version on flickr.

- Ajay


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bluedandelion
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Loc: Hazy Hollow, Western WA
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: bluedandelion]
      #5821222 - 04/25/13 02:18 AM

A combination of the above: 60 percent Juan Conjero palette + 40 percent Hubble palette.


Large version on Flickr.

- Ajay


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Mark72
professor emeritus


Reged: 09/19/12

Loc: Munich, Germany
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: bluedandelion]
      #5821424 - 04/25/13 07:48 AM

The last one is very good Ajay,

Mark


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Mark72
professor emeritus


Reged: 09/19/12

Loc: Munich, Germany
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Mark72]
      #5821447 - 04/25/13 08:15 AM

Terry,

Thanks again for sharing. My bi-color version; SII not used.

http://www.astrobin.com/full/40077/?mod=none

Mark


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JoseBorrero
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Reged: 09/04/09

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Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Mark72]
      #5822916 - 04/25/13 07:48 PM Attachment (8 downloads)

my try: Maxim -->PSCS5

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bluedandelion
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Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Mark72]
      #5823272 - 04/25/13 10:22 PM

Thank you Mark.

So here are the processing details. I worked with two blends - Hubble palette [R: S2, G: Ha, B: O3] and the Juan Conjero (JC) palette [R: 0.5*S2 + 0.5*Ha, G: 0.15*Ha + 0.85*O3, B: O3].

After combining , I did the following in Pixinsight on both blends.

i) Gradient removal via ABE (there wasn't much)
ii) White balance via star method (only on the JC blend)
iii) Green removal via SCNR (only on Hubbble palette)
iv) Richardson Lacy Deconvolution to sharpen up details
v) Histogram stretch
vi) Mask off bright areas and stretch faint wisps via curves
vii) Star reduction via Morphological Transform
viii) HDR Wavelets to improve dynamic range
ix) Local Contrast Enhancement
x) ACDNR Noise reduction
xi) Saturation boost via curves

Finally I experimented blending the two finished images. I do like the combination that Mark picked out.

- Ajay

Edited by bluedandelion (04/25/13 10:24 PM)


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nvc
super member


Reged: 09/16/08

Loc: Denmark
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: bluedandelion]
      #5825670 - 04/27/13 04:15 AM Attachment (14 downloads)

Hi Terry, great raw data, thanks for sharing.
A hubble palette picture is attached.
Bigger picture is here,
Tarantula-40

Processing steps used:
I used CCDStack2 for making scaled DDP images of Ha,OIII,SII subs and saved these as 16bit tif files.
CCDStack2 deconvolve function used on each sub for star size reduction.
CCDStack2 used to create a color image with SII,Ha,OIII subs as RGB layers.
Star colors copied from another artificial color image made from subs like this: red=Ha+24%SII,green=OIII,blue=OIII+15%Ha.
Color enhancement done via Lab color and match color in photoshop CS4.
Noel Carboni action, local contrast enhancement, and a highpass filter used in photoshop CS4 to enhance the details in the picture.
Neat Image photoshop CS4 plugin used for noise reduction.

Best regard Niels

Edited by nvc (04/28/13 04:38 PM)


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DarkStarAstro
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Reged: 02/22/13

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Re: Raw Data available for Tarantula Nebula 17 hours new [Re: nvc]
      #5827655 - 04/28/13 01:39 AM

Thanks for the data Terry!
Here is my quick go at it, basically a modified HST. All processing done in CS5.1 extended.
Curves & Levels
Mapped:
SII-R
Ha-G
OIII-B
Soft light duplicate layer @ 20% opacity for additional contrast
Selective color adjustments
Mild smart sharpening
1.5pixel gaussian blur w/ inverted layer mask to reduce background noise slightly

Really nice data to work with, appreciate you sharing it!



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Ken Crawford
sage


Reged: 06/02/09

Re: Raw Data available for Tarantula Nebula 17 hours new [Re: DarkStarAstro]
      #5828009 - 04/28/13 10:10 AM

This is a very good exercise in processing and really shows why I love NB imaging/processing. The greater "freedom" to leverage color to reveal structures and details that would be normally muted within the more monotone hues of "natural" colors of emission nebulae. Each of the examples here shows nice variation and bravo to each one of you and to Terry for sharing his data with the world.

This is one of my favorite subjects that I worked on when I had equipment with Don Goldman at Riverland Dingo Observatory. The processing choices I made had to do with the fact that the core of this amazing subject looked almost electric to me and I wanted to separtate those structures as much as possible. Some of the examples here do a nice job in doing that.

Congrats to all for the very nice results!


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Dr Benway
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Reged: 03/27/08

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Re: Raw Data available for Tarantula Nebula 17 hours new [Re: jgw12936]
      #5828722 - 04/28/13 04:44 PM

My version with Ha=Red, Synthetic Green, and OIII=Blue.

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Dr Benway
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Re: Raw Data available for Tarantula Nebula 17 hours new [Re: jgw12936]
      #5828726 - 04/28/13 04:46 PM Attachment (11 downloads)

My version with Ha=Red, Synthetic Green, and OIII=Blue. Processed with PixInsight, Registar, and Photoshop CS6.

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Man in a Tub
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Reged: 10/28/08

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Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Dr Benway]
      #5828984 - 04/28/13 07:50 PM Attachment (7 downloads)

Ha = Red, Synthetic Green, OIII= Blue. Fits Liberator and Photoshop CS6

Thank you, Terry. Somewhere I have a CD with POSS1 and POSS2 Fits of the Tarantula Nebula which I gave up trying to work with a few years ago. Your data is irresistible. I'll work with it over and over again.


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DugDog
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Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Man in a Tub]
      #5829420 - 04/29/13 12:41 AM Attachment (6 downloads)

Fun to Process! Thanks! Lots of hearts in this target.

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DugDog
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Re: Raw Data available for Tarantula Nebula 17 hours new [Re: DugDog]
      #5829432 - 04/29/13 12:50 AM Attachment (5 downloads)

Lots of detail, congrats on an excellent capture!

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TCFenua
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Reged: 04/19/13

Loc: Tahiti
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: DugDog]
      #5833727 - 05/01/13 06:42 AM

Thank you for the awesome data, Terry

here's is my take ( first SHO picture ever so don't laugh, haha ) :


Click on the picture for a bigger version

Here for the full size one (4.9 mb)

And here's my workflow :

First with PixInsight ( on the H, S and O layers ):
_Dynamic background extraction
_Starmask and star deconvolution
_Duplicate the image, stretch the histogram to only get the stars and the core of the nebula, apply that in reverse, noise reduction with "ATrousWaveletTransform"
_Non linear mode with histogram stretch on the main picture
_Duplicate once, "range selection" to only get the nebula itself.
_Apply "HDRMultiscaleTransform" with 8 layers, overdrive 190 and checked lightness mask on the first picture.
_Same but with 5 layers instead of 8 and overdrive set to 0 on the copy.
_Addition of the two pictures with "PixelMath"
_SHO script : this one is a bit complicated. First I had to synthesize the L layer with the processed SHO files, then mix it with the following settings :
Red layer : 100% SII
Green layer : 40% SII, 60% OIII
Blue layer : 40% Ha, 60% OIII
I used also the Ha as R, SII as G and OIII as B for the LSHORGB mix.
_Apply some curves : saturation, CIE c* component and L slightly boosted.
_Script HaRGB with the Ha as Ha and the LSHORGB as RGB.
_Sample conversion from 32 to 16 bits and save as a Tiff file.

With Photoshop now ( mostly to soften the result, which can be harsh sometime with astrophotography ):
_A bit of curve adjustment to improve contrast.
_Duplicate the layer.
_Brighten a bit the bottom layer and set the top to about 70-75% opacity.
_Duplicate the bottom layer
_Apply a median on the middle layer ( noise reduction ) with a pixel size of 5.
_Apply a gaussian blur still on the middle layer of 4-5 pixels and set the opacity to 50-60%.
_Sharpen the top layer a bit ( 20% gain, 1 pixel radius ).
_Flatten the image and save as a jpg.

And that's it

I hope it'll help you Terry, and you'll find some ideas.

Again, thank you for the raw data so we can all experiment on processing


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microstar
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Reged: 01/05/08

Loc: Canada
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: TCFenua]
      #5834523 - 05/01/13 02:23 PM

Yes, thanks Terry for posting your data. This has been a really interesting exercise. I'm going to bookmark this to go back over the different processing steps from different versions to pick up some tips on how to improve my workflow. In a few weeks we'll hit astronomical twilight until August and so I'll have lots of time over the summer to review technique improvement! Very helpful.
...Keith


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Terry R
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Reged: 01/31/13

Loc: Australia
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: microstar]
      #5841370 - 05/05/13 09:55 AM

I would like to thank all those who participated in playing with the raw data and sharing their results and techniques with everyone. Itís been a great experience, and I have definitely learned a few more image processing tips.

Terry


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steveyzh
super member


Reged: 02/20/11

Re: Raw Data available for Tarantula Nebula 17 hours new [Re: bluedandelion]
      #5849379 - 05/09/13 07:46 AM

Quote:

A combination of the above: 60 percent Juan Conjero palette + 40 percent Hubble palette.


Ajay,I like this version a lot.Tiny stars with colors, detailed structure(especially highlight parts in core) and contrast w/o much sharpening, dark areas, and lovely colors. Really NICE JOB!

Steve
Large version on Flickr.

- Ajay




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bluedandelion
Carpal Tunnel
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Reged: 08/17/07

Loc: Hazy Hollow, Western WA
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: steveyzh]
      #5851028 - 05/09/13 10:10 PM

Thank you Steve. You pointed out all the items I strived to bring out. Really appreciate it.

Ajay


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hoa101
super member
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Reged: 02/04/12

Loc: Northern Virginia
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: bluedandelion]
      #5851168 - 05/09/13 11:51 PM Attachment (1 downloads)

Thank you for the data, it was excellent! I really enjoyed playing with it.

I finished my final exams tonight and needed some practice processing, so I took a stab with Startools 1.3. I have almost no processing experience - but as you can see the learning curve is not too bad.

I also used the PixInsight palette, mostly because I had never heard of the technique before. I think it comes out rather nicely. Maybe I will try Hubble later on.

Full size on Flickr


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carastro
member


Reged: 05/01/13

Loc: England
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: jgw12936]
      #5851359 - 05/10/13 04:57 AM

Thank you for posting up the data from one of my favourite objects which I cannot image from the UK.

Can't seem to attach an image of any quality within the 200Kb sizing.

All I can manage is this link which doesn't show an image on this page. I don't think I have come accross such a difficult forum to work out how to do things.

I didn't keep a note of how I processed this, but from memory, I used Photoshop CS3 and used the hubble pallet R(sii, G (Ha), B (Sii). Stretched with levels and curves, added Ha as a layer and combined as luminosity, possibly around 60%, flattened and then fiddled around with selective colour until I got a result I liked.

Still trying to post an image. Found out how to do it now, but it keeps rejecting them as too large.

web page

Edited by carastro (05/11/13 05:11 PM)


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hoa101
super member
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Reged: 02/04/12

Loc: Northern Virginia
Re: Raw Data available for Tarantula Nebula 17 hours *DELETED* new [Re: carastro]
      #5851523 - 05/10/13 08:19 AM

Post deleted by hoa101

Edited by hoa101 (05/11/13 11:35 AM)


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Tapio
Pooh-Bah


Reged: 09/24/06

Loc: Tampere, Finland
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: hoa101]
      #5852039 - 05/10/13 01:29 PM

Thanks for sharing.
First time I tried NB processing.
This time I used Nebulosity (might try AstroArt for comparison).



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hoa101
super member
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Reged: 02/04/12

Loc: Northern Virginia
Re: Raw Data available for Tarantula Nebula 17 hours new [Re: Tapio]
      #5853693 - 05/11/13 12:17 PM

I was not quite happy with the images I did yesterday, so I thought I would post a couple versions from methods I found on the forum. Two bicolors and one "PixInsight" palette tri-color, plus another HST. All four use a synthetic luminance from a blend of 33% of each channel. This seems like alot of work, but it actually goes really fast in Startools. Only the Lum file takes time. The color is easy, because you can just heavy-hand it. Humans do not really notice color detail in pictures.

That is some ridiculously good data, especially for an urban image.

With these I think I have reached the current limit of my processing skill.

Bicolor I (details on flickr)


Tarantula Nebula Bicolor - Data from Terry R. on Cloudynights by rhubarb803, on Flickr

Bicolor II


Tarantula Nebula Bicolor - Data from Terry R. on Cloudynights by rhubarb803, on Flickr

"PixInsight" Palette Tri-Color


Tarantula Nebula "PixInsight" Palette - Data from Terry R. ... by rhubarb803, on Flickr

HST Palette


Tarantula Nebula HST Palette - Data from Terry R. on Cloudynights by rhubarb803, on Flickr


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astrochuck123
member


Reged: 01/09/12

Re: Raw Data available for Tarantula Nebula 17 hours new [Re: jgw12936]
      #5853834 - 05/11/13 01:41 PM Attachment (3 downloads)

Thanks Terry for the data.This is something I will never have the opportunity to image, so this was great!

Edited by astrochuck123 (05/11/13 01:47 PM)


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dp297
sage


Reged: 12/14/10

Re: Raw Data available for Tarantula Nebula 17 hours new [Re: steveyzh]
      #5882525 - 05/24/13 03:15 PM Attachment (6 downloads)

And my take on the data with PI (PI seriously rocks!!!)

Edited by dp297 (05/24/13 03:32 PM)


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