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The Fireworks Galaxy and Cluster


PeterBolt
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Here's my first attempt at processing the data I collected over 5 nights during last weeks full moon.  I found it difficult to bring out the colour and detail of the galaxy without blowing the stars.

 

Exposure: 10.25 hours of 180s subs

Scope: Helios 200P with Skywatch Coma Corrector

Camera: Canon EOS 1000D (modified)

Filter: Skytech L Pro Max

Mount: Celestron AVX

 

Capture: NINA

Processing: Deep Sky Stacker and Photoshop

 

Fireworks_PCB_10hrs_StarTools_Colour.thumb.jpg.1d25a1a3cc70f8215d5cd81c3c1b9b75.jpg

 

Reprocessed to increase detail in the cluster and Galaxy:

 

Fireworks_PCB_10hrs_StarTools_ColourMask_2.thumb.jpg.009d02f976373659915c30324a8a5e5b.jpg

 

Edited by PeterBolt
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7 minutes ago, AstronomyUkraine said:

It removes the stars while you work on the galaxy or nebula. Then you can reintroduce the stars later in the process. Make sure you check the box, "make star mask", or you will just be left with an image with no stars in it.

Brilliant thanks again

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23 hours ago, AstronomyUkraine said:

It removes the stars while you work on the galaxy or nebula. Then you can reintroduce the stars later in the process. Make sure you check the box, "make star mask", or you will just be left with an image with no stars in it.

I've had a quick play with starnet++ but it removes everything leaving including the galaxy...any ideas?

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I just use the basic command line parameters - "rgb_starnet++ xxx.tif" or "mono_starnet++ xxx.tif" depending on colour or mono. Input file has to be 16-bit tiff (it will complain if it's not) and it will write starless.tif out. I don't change any of the default parameters.

 

The input file can be lightly stretched or fully stretched - a light stretch can be useful to extract good RGB stars to add back to a fully-stretched galaxy or nebula. If you feed in a linear un-stretched file it generally will not work.

 

Starless:

image.thumb.png.89f9511253e61516235a2c38a191c247.png

 

Stars:

image.thumb.png.66acb7a4d36607ad7ff64f80f5da6025.png

 

The blotches in the starless image are left behind by particularly big stars, and need to be processed out by the clone tool or the heal tool. It can be a pain but it's usually worth it.

 

Sometimes it just doesn't work with a particular image.

 

I just get starnet to produce the starless version, then I subtract that in Gimp from the original to get the stars. I haven't used starnet to generate a star mask - must experiment with that.

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2 hours ago, PeterBolt said:

I've had a quick play with starnet++ but it removes everything leaving including the galaxy...any ideas?

I use the version integrated with Pixinsight. The standalone version might be different. With the integrated version you can extract just a starless image, or the starless image and the stars. The stars can then be reintegrated later in the process.

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25 minutes ago, Padraic M said:

I just get starnet to produce the starless version, then I subtract that in Gimp from the original to get the stars. I haven't used starnet to generate a star mask - must experiment with that.

The star mask generated by Starnet is just the name they give to the image that the contains the stars. It can be used as a star mask, but is usually just added back into the starless image after colour correction etc.

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From memory I don’t believe the standalone version of Starnet++ will create a star mask. It just removes the stars leaving a starless image. You can specify input file, output file (starless) and the stride. 

Of course the PI version creates an optional star mask too.

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2 hours ago, Padraic M said:

I just use the basic command line parameters - "rgb_starnet++ xxx.tif" or "mono_starnet++ xxx.tif" depending on colour or mono. Input file has to be 16-bit tiff (it will complain if it's not) and it will write starless.tif out. I don't change any of the default parameters.

 

The input file can be lightly stretched or fully stretched - a light stretch can be useful to extract good RGB stars to add back to a fully-stretched galaxy or nebula. If you feed in a linear un-stretched file it generally will not work.

 

Starless:

image.thumb.png.89f9511253e61516235a2c38a191c247.png

 

Stars:

image.thumb.png.66acb7a4d36607ad7ff64f80f5da6025.png

 

The blotches in the starless image are left behind by particularly big stars, and need to be processed out by the clone tool or the heal tool. It can be a pain but it's usually worth it.

 

Sometimes it just doesn't work with a particular image.

 

I just get starnet to produce the starless version, then I subtract that in Gimp from the original to get the stars. I haven't used starnet to generate a star mask - must experiment with that.

Ok thanks looks like I just need to do a bit of experimenting

 

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13 minutes ago, TerryMcK said:

I’ve not tried it but some people say you can drag and drop the tif straight onto the starnet.exe file and it will produce the starless image in the same directory as the exe

I downloaded the stand alone version and verified it worked with the sample image they provided.  But when I tried it on my image it removed everything in the image so I was left with just a black background.  I will have another try tomorrow 😃

Edited by PeterBolt
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I've tried starnett++ on the stretched image but it still removes everything even the galaxy 🤔

 

I did try to reprocess the image using the star tools action set.  Including the 'make stars smaller action'.  I think the galaxy has a bit more definition to it now.

 

Fireworks_PCB_10hrs_StarTools_ColourMask_1.thumb.jpg.526a17a4b07b21f4169e9d28f2e39bd6.jpg

 

 

 

 

 

Edited by PeterBolt
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