Author Topic: Help with NGC300  (Read 5100 times)

Offline GrantBoxer

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Help with NGC300
« on: 2012 October 16 04:49:17 »
Hi All,

I have collected 15 images of NGC300 at 5 min each and have tried processing the resulting integrated image. I do not seem to be able to get a good result. I would appreciate it if someone could take the time and try processing this for me. I would like to attach the initial integrated fits file and my best attempt as a jpeg is attached.

The jpeg is a result of DBE, Background Neutralisation, Colour Calibration, Atreous Wavelets and Histogram stretch in that order.

Can you advise how I can upload the fits file (60 Mb)? Or alternatively, someone may be able to walk me through the process?

Regards Grant

Offline Alejandro Tombolini

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Re: Help with NGC300
« Reply #1 on: 2012 October 16 17:14:15 »
Hi Grant, It would be interesting to make a try.

See this for information about how to upload the image: http://pixinsight.com/forum/index.php?topic=4039.msg27992#msg27992

Regards, Alejandro.

Offline GrantBoxer

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Re: Help with NGC300
« Reply #2 on: 2012 October 16 18:01:25 »
Hi Alejandro,
I have registered to upload my file, but my login does not seem to work. I will try again later today in case the system takes a while to update.  I will advise when I have managed to upload the file.
Cheers Grant

Offline GrantBoxer

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Re: Help with NGC300
« Reply #3 on: 2012 October 16 19:42:01 »
Hi Alejandro,

I think I have correctly uploaded the file to "http://endor.uv.es//data/public/0794dafbc94c381b28637fcf989b4e43.php?lang=en".

Please advise if this is not correct.

Cheers Grant

Offline Alejandro Tombolini

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Re: Help with NGC300
« Reply #4 on: 2012 October 16 20:36:36 »
It works perfect. Thanks.  I could download it.

Saludos.
Alejandro.

Offline GrantBoxer

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Re: Help with NGC300
« Reply #5 on: 2012 October 16 22:40:46 »
Hi Alejandro,

Great! I was a little unsure I had done it correctly. The images were taken with a QHY-8 single shot colour camera using a GSO 6" Astrograph on a Skywatcher HEQ5 mount using autoguiding. I will be most interested to hear your comments and suggestions.

Regards Grant

Offline Alejandro Tombolini

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Re: Help with NGC300
« Reply #6 on: 2012 October 20 16:25:47 »
Hi Grant, something seems to be wrong in the debayer of the images. Could you please check if the images you have selected for integration, are correctly debayered?

Tanks, Alejandro.

Offline GrantBoxer

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Re: Help with NGC300
« Reply #7 on: 2012 October 21 19:03:18 »
I have uploaded one of the debayered images for you to have a look at. This is pre-integration and is one of the group integrated.

The file is loacted at "http://endor.uv.es//data/public/fdf57311a567ae0dd2bed0d7fbcc2957.php?lang=en"

Cheers Grant

Offline GrantBoxer

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Re: Help with NGC300
« Reply #8 on: 2012 October 21 23:05:43 »
Please also find the original fits file from my camera. Perhaps I have settings incorrect?

attached: http://endor.uv.es//data/public/599f1943adbd2b418c162804f84abee9.php?lang=en

Regards Grant

Offline GrantBoxer

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Re: Help with NGC300
« Reply #9 on: 2012 October 23 23:30:10 »
There does seem to be problem with the debayering in PI and I am trying Nebulosity and AstroArt for comparison. I will advise if I find out what is wrong.

Cheers Grant

Offline GrantBoxer

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Re: Help with NGC300
« Reply #10 on: 2012 October 24 00:33:38 »
I have pre-processed the files in AstroArt to an integrated RGB, then used the histogram and curves in PI. The result seems much better so I must have a problem with the pre-processing I am doing in PI. I have attached a small jpeg to show the current result.

Cheers Grant

Offline Alejandro Tombolini

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Re: Help with NGC300
« Reply #11 on: 2012 October 25 16:57:39 »
Hi Grant,

It seems you are using RGGB as debayer pattern in PI but I think that the correct one for your camera might be GBRG.
I suggest to check it and debayer your calibrated images with BatchDeBayer selecting that pattern.
After that, the alignment and Integration in PI will give a good image to be processed.

Regards, Alejandro.

Offline GrantBoxer

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Re: Help with NGC300
« Reply #12 on: 2012 October 25 17:38:45 »
Hi Alejandro,

yes, I think you are correct. I have been trying a number of options and the GBRG seems the best one. Would you suggest the superpixel or VGN method for debayering?

Many thanks for your assistance.

Regards Grant

Offline Alejandro Tombolini

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Re: Help with NGC300
« Reply #13 on: 2012 October 25 19:16:03 »
I use VNG in it works fine in my Canon image. Also is the default method that PixInsight used for debayering.
You might want to take a look at the definitions of each one in the documentation of the tool.

Regards, Alejandro.

Offline GrantBoxer

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Re: Help with NGC300
« Reply #14 on: 2012 October 25 22:31:02 »
Hi Alejandro,

I have re-processed the image and it looks a lot better. Shows up my poor focus when I crop and enlarge!

Thanks for your help.

Cheers Grant