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Messages - IamTomzo

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General / Re: Odd artifacts after integration
« on: 2019 February 10 21:46:18 »
I just went back and looked and it seems that I had not selected any pixel rejection at all.   I re-ran with windsorized sigma clipping and it is much, much better.   Sometimes I am my own worst enemy!

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General / Re: Odd artifacts after integration
« on: 2019 February 10 21:40:01 »
Ahh - that makes sense.   I guess I am seeing my dithering there!   I will find the appropriate controls and make sure I check the right boxes next time.

Thanks

Tom

3
General / Odd artifacts after integration
« on: 2019 February 10 19:26:20 »
Greetings,

I was processing 19 subs (5 min each with flats, darks, and bias frames) and after preprocessing, subframe selection, and integration was complete, my image has this wierd y shaped pattern that repeats itself all over the image.   I looked at each of the calibrated subs and this pattern is not present in any of them.

Do any of you have an inkling of where I went wrong here?

Thanks

Tom

4
Gallery / Re: First try with Rosette and PI - C&C welcome
« on: 2019 February 01 16:48:00 »
Thanks Rodd - the "space is not black" reminder is necessary.   For whatever reason, my primordial brain always wants that inky black background.   I think I am in for a rainy weekend, so perhaps I will make another run at this one!

I just ordered a CEM60 so my guess is that it will be cloudy for months now.....

5
Gallery / Re: IC-1396 Close up and far removed
« on: 2019 February 01 16:43:32 »
My hat is off to you, sir!

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Gallery / Re: Thor's Helmet Widefield
« on: 2019 January 24 06:22:02 »
Looks like decent data to me!   Nice!

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Gallery / Re: NGC-1333
« on: 2019 January 24 06:20:05 »
Amazing image.   If you would be so kind, perhaps you could answer a quick question:  For all of those subs, followed by the various calibration frames, what do you think the total amount of disk space was for this image project?   I am wrestling with a rapidly shrinking amount of space on my hard drive and want to plan out more storage but want to calibrate my expectations.

Thanks

Tom

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Gallery / Re: First nb integration
« on: 2019 January 20 13:09:16 »
Nice!   I am interested in the 1600 - do you see the reflection issue that some have reported on bright stars?

Thanks

Tom

9
Thanks Acmalco - I gave that a go on a linear image and the platesolve worked with a score of 80.33 after four iterations.   I then reset all the parameters in photometric color calibration to auto on everything I could and lo and behold it worked!

Thanks

Tom

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Anders - I sent you a private message with the file link.

Thanks

Tom

11
I think I may have figured this out - I was informed that PI only will do platesolving on linear images and mine was already stretched.   I will try it again on a non-stretched image.

Tom

12
Thanks Rob - I saved a file but it was about 180 MB and Astrobin could not handle it.   How do folks make a "small" xisf file out of PI?

Tom

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Gallery / Astrobin can plate solve my image but not PI - hints?
« on: 2019 January 12 09:52:34 »
Greetings

I have an image of the Rosette nebula that astrobin was able to platesolve without problems, but PI won't for some reason.   I am not getting enough star pair matches.  Clearly I am doing something wrong here.  Have any of you experienced this with the plate solve system in PI?   I was hoping to apply some photmetric color calibration to my image.

One thing I did notice is that when I acquire the focal length and pixel size from the image they appear to be incorrect.   I am imaging at 510mm (Orion 80ED with 0.85 FR) and use a Canon 500D which has a pixel size of 4.7 microns from my understanding.   PI reports the focal length at 996 mm and a pixel size of 9.  I have tried it with PI's values and values I enter directly with the same result.

I have used the tool in PI to set the coordinates on NGC2244 and those look correct.

I am sure that I must be missing something simple here - any hints?

Thanks

14
Gallery / Re: First try with Rosette and PI - C&C welcome
« on: 2019 January 11 18:58:38 »
Thanks Geoff - that is extremely helpful.   I made those adjustments and it is certainly a big improvement.

https://www.astrobin.com/385484/?nc=user

I really like to have nice black background and in the past I have used Photoshop's dropper tool in the curves tool to set the black point.   This quickly makes a nice aesthetic look to an image.   Is there a similar tool in PI?

Tom

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Gallery / First try with Rosette and PI - C&C welcome
« on: 2019 January 10 21:35:10 »
Greetings,

I got some clear nights last week and managed to get over 5 hours on Rosette.   I used darks, flats, and bias frames, all taken through an Orion 80ED with a modified Canon 300D with an Optolong CLS-CCD filter.   

I think my guiding was good enough and I am pleased overall with the data, but I am so new to PI that I am kind of hitting a wall on processing further.   Here is what I have done:

-   Batch preprocessed using calibration frames listed above.
-  I did a standard STF and applied it via HT
-   I did an iternation of DBE as there was a green cast around the edges.   Some of it is still there.

I did a few other "super stretch" efforts but I am confident those are probably a bit too much.

I have a couple of questions:

-   How can I bring out star colors?   Mine are all white, and I am sure that there must be some color in there somewhere.   I am not quite clear on the star mask method to get the colors out.
-   I would like to make the nebulosity pop a bit more but when I stretch I get other artifacts coming up.
-   I tried the color calibration tools but I am not sure I am getting the right colors here.

Any guidance is appreciated!

Here is a link to the image:

https://www.astrobin.com/385352/

Thanks

Tom

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