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Raw Data available for Tarantula Nebula 17 hours

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#26 Mark72

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Posted 25 April 2013 - 07:15 AM

Terry,

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

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

Mark

#27 JoseBorrero

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Posted 25 April 2013 - 06:48 PM

my try: Maxim -->PSCS5

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#28 bluedandelion

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Posted 25 April 2013 - 09:22 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

#29 nvc

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Posted 27 April 2013 - 03:15 AM

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

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#30 LazyLightning

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Posted 28 April 2013 - 12:39 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!

Posted Image

#31 Ken Crawford

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Posted 28 April 2013 - 09:10 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!

#32 Dr Benway

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Posted 28 April 2013 - 03:44 PM

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

#33 Dr Benway

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Posted 28 April 2013 - 03:46 PM

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

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#34 Man in a Tub

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Posted 28 April 2013 - 06:50 PM

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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#35 DugDog

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Posted 28 April 2013 - 11:41 PM

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

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#36 DugDog

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Posted 28 April 2013 - 11:50 PM

Lots of detail, congrats on an excellent capture! :waytogo:

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#37 TCFenua

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Posted 01 May 2013 - 05:42 AM

Thank you for the awesome data, Terry :)

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

Posted Image
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 ;)

#38 microstar

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Posted 01 May 2013 - 01:23 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

#39 Terry R

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Posted 05 May 2013 - 08:55 AM

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

Terry

#40 steveyzh

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Posted 09 May 2013 - 06:46 AM

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

Posted Image
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



#41 bluedandelion

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Posted 09 May 2013 - 09:10 PM

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

Ajay

#42 hoa101

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Posted 09 May 2013 - 10:51 PM

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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#43 carastro

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Posted 10 May 2013 - 03:57 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

#44 hoa101

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Posted 10 May 2013 - 07:19 AM

Post deleted by hoa101

#45 Tapio

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Posted 10 May 2013 - 12:29 PM

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

Posted Image

#46 hoa101

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Posted 11 May 2013 - 11:17 AM

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)

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

Bicolor II

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

"PixInsight" Palette Tri-Color

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

HST Palette

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

#47 astrochuck123

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Posted 11 May 2013 - 12:41 PM

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

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#48 dp297

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Posted 24 May 2013 - 02:15 PM

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

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