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Astrophotography and Sketching >> CCD Imaging & Processing

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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
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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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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

Loc: Puerto Rico Island
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

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

Loc: Central Alabama
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

Loc: Abilene, TX
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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Reged: 03/27/08

Loc: Abilene, TX
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

Loc: Fogpatch, CA
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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Reged: 12/19/07

Loc: Temecula, Ca. USA
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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Reged: 12/19/07

Loc: Temecula, Ca. USA
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
member


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
Pooh-Bah


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
member


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
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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