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Messages - jtalbot

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61
Gallery / Re: M106
« on: 2011 May 19 16:04:38 »
Harry,

Don't fool yourself, this is a fantastic image.  Extremely well done.  Lovely color saturation, especially with the stars.

Jon Talbot

62
Gallery / Re: IC443
« on: 2011 May 09 17:58:52 »
Hi Jules,

First, very nice image of IC443.  You were able to capture a significant amount of data on this faint object.  I see some unexpected dark areas near the nebula on the right hand side.  I am wondering if maybe your calibration frames were not optimal or maybe this is a processing artifact.  Otherwise this looks very nice. Considering you just started imaging, I wish I had such good results during my first entire year.  Congrats on a very nice image.

Jon Talbot

63
Gallery / Re: M106 NGC4217
« on: 2011 May 04 15:17:24 »
Very Nice Giorgio.  I love the color saturation of the stars.  Excellent processing job and congrats.

Jon Talbot

64
Gallery / Re: M42 HDR
« on: 2011 May 03 19:10:27 »
Here is a redo of my original image.  This time color to the core.  I had to stretch the color frame in PS then bring it back into PI combine with the luminance frame.  I used the PI HDR script to produce the Luminance and individual color frames.  I also applied two iterations of HDWR to the luminance and used ADCNR to reduce the noise. Curves and color sat in PI.  I think this is much better than the original.  Definitely a different look to M42.  Total exposure time was 240min at .86arcsec/px.

65
Gallery / Re: Abell 81 - Planetary Nebula in Cepherus
« on: 2011 May 03 13:06:58 »
Lovely image Maxim,

I even see a bit of an outer halo visible which you may be able to bring out with another few hours of exposure time.  I have not seen many images of Abell 81.  Congrats,

Jon Talbot

66
Gallery / Re: M42 HDR
« on: 2011 May 03 13:01:19 »
Hi Georg,

Thanks much for your comments and script.  I'll give it a try and see what happens.  Yes, I agree and understand what is happening to the color as the values approach saturation, everything goes white.  I may try a mask when stretching the image using several stretched versions of the core.  I know exactly how to do this in PS but I would like to figure this out in PI and keep everything in 64bit floating point.  I am hoping that maybe Vicent has something up his sleeve and has successfully conquered this problem.

Jon Talbot

67
Gallery / M42 HDR
« on: 2011 May 02 21:07:49 »
Hi folks,

Here is an image I took of M42 with several exposure times from 5 sec to 120sec to try out the HDR routine. All the data was rather short (total of 30min of exposure time) So its not extremely deep by any means.  I took the Luminance and color this way and created HDR subs of L, R, G, and B.  Combined to RGB and then added the processed Luminance.  The HDWR transform was used on both the luminance and RGB frames.  All the data was there but am having trouble keeping the colors in the core region.  I tried many different types of ways to stretch the color frames so as to not blow out the core and keep the color there but am at a loss on how to do it.  Any ideas?  In the non stretched RGB there is actually some nice color in the trapezium area but how to stretch and not totally saturate it is the question.


Jon Talbot

68
Juan,
I just watch Vicent show off this new functionality at NEAIC.  What a nice feature to be able to save the state of your work then later bring up the application and everything is right where you left off.  Congrats.

Jon Talbot

69
Gallery / NGC 1491
« on: 2011 January 30 20:14:27 »
Hi Folks,
First of all, I am Jon Talbot.  I've been a PI user since the early days of LE.  I really have been lacking in the communication department on the PI forum over the years due to a bit laziness and hectic work schedule but have enjoyed reading the huge number of educational posts recently. 

Here is an image of NGC 1491 done in HaRGB using Vincents tutorial about continuum separation http://pixinsight.com/tutorials/narrowband/theory/en.html .  I recently have been using a red continuum filter when shooting narrow band images to seperate the stars out from the nebulous areas and separately processing each so I thought I would try and mix Ha into a normal RGB image.
For this image I used Vincent's idea of using the master red frame to separate the continuum emission out from the Ha emission.  I think the image came out pretty well but am thinking that I could just have used my red continuum filtered image which just captured the stars so I need to try that too.  I think this technique would also work well with the SII and OIII frames but am mulling over how to constructively add SII and OIII into the HaRGB mix.  I know how to do it in PS by mapping different colors to individual filtered master frames but am a little bit confused about how to do the same in PI.  If anyone has ideas on how to do this I would love to know.

Anyways here is a link to the image: http://www.starscapeimaging.com/NGC1491_Jan11.html 

Best Wishes

Jon Talbot

70
General / Star Masks
« on: 2005 January 02 15:24:51 »
Hello guys,
I am enjoying PixInsight LE very much.  A month or so ago a discussion was started on the CCD listserv about using a star mask in PixInsight to remove stars from the image.  What I'm looking to do is remove trailed stars from an image of a comet.  The image was stacked on the comet so the stars are trailed.  I also stacked a set of the same frames aligning on the stars instead of the comet.  I am trying to remove the trailed stars from an image and adding the stars from the other image.  I know this is fairly easy but I'm having a little trouble figuring out what to do first.

Thanks for the help

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